Ah yes i get it now..
When removing my ones i grabbed a long piece of 15mm copper tubed, squeezed it oval and it was just right to hold the top of the piston head.
Now that it’s dis-assemebled im’ thinking i might modify the piston heads to fit into a normal socket by pushing the socket onto the pistons you can see the tight spot and just dremel them away- i can’t see that it’d cause any problems.
