Thanks ped. Points noted for when I have a tinker.
If I was feeling flush at the time, I'd probably go down the complete flat too conversion, replacing pump head and valve body at the same time. But power not a requirement anyway, so maybe better just to do as above.
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look up about stuffing a piston and shaving the valve nose also packing the pump cup from the piston and pinning it
all diy mods that will gain power for a bit of elbow grease