nah, when you unscrew the piston washer and holder, you get an m8 threaded rod sticking out. if you machine back the shoulder of the piston face, to increase the stroke, as i mention above, leaving the central section around 22 mm fo fit inside the tighter section of the seal, then screw on a machined ally disc 3mm thick to form the mushroom that retains the seal, around 6mm of that m8 rod will be left pocking through... just chop it off flush.

i did take a piccy, will post in up over the weekend.

defo sleeve down the port.. just loctite the tube in.