Sentinel System Maintenance - Head Unit & Leg Sections
Sentinel Head Unit
The head unit is machined from 7000 series aluminium and hard anodised to provide a durable corrosion-resistant finish.
We have chosen a more expensive 7075-T6 aluminium material for our products because we required them to provide increased hardness over the more economical & easier to machine 6061 -T6 more commonly used in shooting accessories. The 7075-T6 aluminium we use has approximately 1.5 times the shear strength of 6061-T6.
- Main Body
- Top Cap
- Magnetic Spigot
- Top Bearing Cup
- Foot Piece
- Bottom Bearing Cup
- Magnet (fitted into Spigot - 3)
The unit can is easy to disassemble in the field without tools, and there is very little to go wrong.
1. With all three leg units and the Sentinel Tripod Hook (if installed) removed, unscrew the Top Cap (2) ring fully and remove from the Main Body.
2. Remove the Magnetic Spigot (3) from Main Body (1) together with the Top Bearing Cup (4)
3. The Bottom Bearing Cup (7) will normally be retained with the body of the Main Body. It does not need removing unless it is worn, damaged or the area cannot be cleaned a satisfactory level without its removal. In this case, a small pick type tool can be used to loosen & remove it.
4. Clean out the internal area of the main body using a clean rag & a small brush to remove embedded dirt & grit. Fresh clean water can be used to rinse the head unit if especially dirty.
5. Inspect the Top & Bottom Bearing Cups for wear & damage. These are serviceable items, and replacements are available from us.
6. Inspect the Magnetic Spigot for any defects & excessive wear.
7. Wipe over all parts until clean & dry. Apply a very small amount of silicon grease on the threads to lubricate the Top Cap, and to the female threads for the Foot Piece & Sentinel Tripod Hook.
If the conditions are especially sandy consider using a dry type lubricant, so that grit doesn’t stick to the threads.
Legs are stiff to manoeuvre
Remove the three screws that fasten the Foot Piece to Head Unit, and remove & wipe clean the fittings, and applying a thin smear lubricant to the contact faces between Foot Piece & Head Unit, and then reassemble.
We recommend that the screws have a small amount thread lock applied to them upon reassembly, and tensioned so that the fittings feel firm which will prevent the legs moving or folding in unintentionally during use.
Sentinel Leg Units
The Sentinel carbon fibre legs are formed from 3 individual sections, matched to a removable/replaceable foot-piece, with tungsten carbide tip.
The two locking joints between the upper & lower legs are machined from 7000 series aluminium and have been specifically designed to create a strong joint section that overlaps the carbon fibre sections.
When disassembled for normal cleaning the leg components are self-contained with little to go wrong or be lost.
1. Unscrew each of the assembled leg units from the Sentinel head unit.
2. Unscrew the lower leg joint fully until the lower leg section can be slid out & fully removed from the middle leg section.
3. Repeat this process, so that the middle leg section is removed from the upper leg section.
4. Inspect the male & female threads of the leg locks. A small brush can be used to clean fine grit out of the threads.
5. Wipe each of the carbon leg sections over with a clean cloth to remove dirt. If the legs are especially dirt they can be rinsed under fresh clean running water.
Under field conditions, it is acceptable to use any clean freshwater (streams /rivers) to rinse off access dirt.
6. Clean the internal surfaces of the carbon legs. A suitable rifle cleaning rod & some 4x2 cleaning cloth can be used to clean the internal surfaces of the middle & upper leg sections.
Again under field conditions, it is acceptable to use any clean piece of wood to fabricate a simple cleaning rod with a piece of clean cloth.
Excessive build-up of dirt of the internal surfaces can cause then legs to bind or stick, so it is worth spending time to ensure these areas are clean & dry.
7. Examine the red coloured leg stops. Ensure that they are in serviceable condition without excessive wear. Any chipped or split leg stops should be replaced. These red Leg Stops are part of the mechanism to prevent the legs from being completely pulled put during normal use.
(Please contact Spartan directly for replacements.)
8. Inspect the foot section and the tungsten carbide tips under the rubber boots. If they are excessively worn or damaged.
9. (Pre 2020 Models Only) Ensure that the red Leg Stops are free to rotate on their mounting screw. (They should not be excessively loose when upwards & downwards pressure is applied.)
If they are lose check the tension of the fitting screw. We recommend that the screw be removed refitted with a small amount of thread lock applied to the screw threads.
Note that the Leg Stops they have two flat surfaces machined on the out circumference. These are designed to travel along the internal flats of the carbon tubing and must be aligned for reassembly.)
To reassemble reverse the procedure Start with the upper-leg sections and then fit the lower leg sections. Ensure that the red Leg Stops flats are aligned with the inner flats of the carbon tubing. DO NOT FORCE, just rotate until they are aligned.
2020 Onward Models Red Leg Stops no longer need to rotate as carbon and stops are completely circular. Secure with no wobble but do not overtighten.
11. Apply a very small amount of silicone grease on the threads to lubricate the leg locks. If the conditions are especially sandy consider using a dry lubricant, so that grit doesn’t stick to the threads.
Broken Leg Sections
Most peoples products including ours can be broken with enough force & effort!
In our experience, the most likely component to break in service will be one of the leg sections when used as a trekking pole and subjected to too much dynamic loading.
When overloaded the carbon type will eventually fail at the fulcrum point, which will often be just below the Leg Lock. Often this occurs when moving over some rocky or slippery ground where the leg becomes trapped and the user stumbles or falls against the leg for support, causing the trapped leg to shear. This was designed to be the shear point to allow potential field repair. Typically the lower leg section is the most vulnerable to this damage.
In these cases, it may be possible to achieve a temporary field repair until the broken section is replaced.
By loosening the Leg Lock and carefully reinserting the broken section back into the upper leg. Once the carbon leg section has passed the portion of the Leg Lock that grips the carbon section, the intact tubing will enable the Leg Lock to work in the normal way. Be careful to not apply excessive force on this leg when setting the leg length or in use as it may increase the damage.