I own a 7 year old East Coast 6-ton mini-splitter. (http://
http://www.eastcoastminisplitter.com.../online-store/
scstore/p-001.html?L+scstore+mrrw8658ffa8aca8+1273412911)

The unit worked as advertised, be that slow but effective. Today I
managed to break the return spring for the pump handle. Can these be
replaced? Without that foot lever returning to the up position pumping
becomes a matter of frustration

Also curious if anyone has modified one of these to be electro-hydraulic
or pneumatic-hydraulic?

A final alternative might be to replace the existing bottle jack with a
faster action and higher ton capacity unit. Might anyone here have tried
that already?