"Adjustable Piggyback Dual Springs Damper Shock Absorber" reservoir opening tool

thingiverse

Designed for opening the RC car shock absorber [Adjustable Piggyback Dual Springs Damper Shock Absorber]. To me, it looks like the Xtra Speed shocks with similar names are identical. To me, these shocks seem rather useless without a tool like this as filling with oil would be very difficult, if not impossible, without opening and the reservoirs cannot be opened with standard tools. Mine had also stuck pistons that needed better access. Other than that, these shocks feel very nice and offer much more adjustability than basic shocks can have. This type of shock is supposed to be oil-filled, both the body with springs and the external reservoir (check YouTube for instructions). Filling the reservoir requires screwing off the cap to allow pouring in oil, thus they need to be user-openable. These cheap ones strangely don't have any convenient way of opening, as the cap is flush with the body and there's just one ~1 mm hole 2.5 mm from the center of the lid, not really openable with common tools if tight at all (which it should be). This tool allows using a 1 mm drill bit as the pin for opening the lid, aligning the bit and holding it perpendicular to the lid while turning it open. Usage: 1. Print with pretty much any rigid material fine. 2. Take a 1 mm drill bit to open the small hole likely not fully open after printing. 3. Push the drill bit into the hole, spiral end pointing out from the flat end. 4. Match the flat end of the bit to the reservoir's small hole, push inside some mm. 5. Push the reservoir end into the tool's cavity, keeping the drill bit inside the small hole. 6. By hand hold tight the reservoir body, rotate counter-clockwise (opening direction) the tool while keeping the drillbit from falling out. Be careful not to lose the spring etc stuff falling out of the reservoir. The lid should open rather easily, if everything lined up properly. To re-cap; insert the cap & drillbit as in one of the photos into the tool cavity, push spring etc stuff inside the reservoir body, use the tool to screw back the cap.