hy flo pumps

i have a good collection of metcalf bros hy/flo pumps, which went bust many years ago,i am looking for some advise on how to repair oneof the pistons which
has stopped working,or is there a small place out there that could replace it, by manufacturing one or even repair it,along with the price please ,i am sure lots of people have these great mc`s ,and if someone started making the pistons for them they would make a killing,or does anyone know of any one that works on the very small traction engines anywhere near coventry ,in the midlands as i am sure these may be able to help me out cheers ...and thanks for reading allthe best lan harris
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