Piston stopper tool for engines with 10mm threads. Works on Zenoah G230RC / G260RC / G240RC / G270RC / G290RC / G320RC / G260PU / G260PUH / G231PUH / G231PUM / G260PUM / GZ25N14 / GZ25N23 engines. Also works on Chung Yang CY23RC / CY26RC / CY27RC / CY29RC / GP290 / GP420 / GP460 engines. In general, fits engines with 10mm spark plug hole threads (for example, engines which use NGK "C" class spark plugs like the CMR7H, CR8HIX, etc). Threads into spark plug hole and stops piston from moving, allowing easy removal of flywheel and other rotating parts. This stopper is interchangeable with Zenoah part # 4810-96220 481096220, and with HPI part # Z966.
Use this solid collet plug to remove your super collet without damage.
Simply remove the existing insert, and loosen the screw 2-3 turns.
Put this removal plug in place, and tighten the collet with two wrenches as you normally would.
The collet pops off every time!
No damage to the collet or insert.
No holding the flywheel!
Reusable many times.
By using this tool , the water jacket is pressed down over the o-rings to properly seat the water jacket .This tool threads into the sparkplug hole / tighten the jam nut to push the jacket down . Next install the 3mm bolts and tighten accordingly . This will lessen the possibility of stripping the small bolt holes . We have been using this style of tool for years . Very handy . Comes with bolt / jam nut / 2 steel washers / 1 nylon washer and a protective sleeve for storage .