Have you seen the ' home made' unit in the MB FSM for that ... it also includes a spray evaluator ... all very simple I think..
a fitting so you can put air pressure to the back of the frozen piston ... being CAREFUL to provide wood in front of it... as things like that often build up and the BLOW clear...
If you look at the size of the fitting ... where it adapts to each tool... the size of of the hydraulic fluid opening.... is like pin hole size... might not be very satisfying for that particular job...
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