Wow that's cool! Makes me wonder why 2 years ago everyone here told me to buy a replacement for my 107... because this is clearly evidence that I could have acquired a replacement piston assembly and rebuilt the pump... Oh well, nothing I can do about it now. Good to see someone doing hydro rebuilds despite the fact that it seems frowned upon... not sure why, there's an entire section in the repair manual dedicated to hydro pump maintenance
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147
R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)