Weiler 160 CNC disassemble power chuck

Hello to everyone.

I need a little help.

I want to replace collet chuck with 3-yaw classic chuck on old weiler 160 CNC with siemens 3T controller.

Problem is that I must also replace push/pull barrel, witch I couldt disassemble on side of pneumatic cilinder.

I there anybody who knows hoh is Roehm pneumatic cilider put together on this lathe?

many thanks for answer

best regards