Originally Posted by Dusti69
do they sell those O rings by themselves? that sounds easier to replace
Yes.. tonnes of places sell Orings...
Just the right size is VERY difficult.
(Keep in mind, to replace the Oring, you need to disassemble everything anyways, while you're at it you may aswell replace the piston head)
Unless some one you know has upgraded their piston and everything and has a full TM stock piston (don't bother with stock CA pistons, many of them have the same problem as the cyma 028 pistons) upgrading piston head will be your best course of action.