Hey so it wasn't just my bad luck! I knew something didn't look normal on those screws. Woulda been helpful to know a while ago, but that are you gonna do eh? At least I know that now for when I start looking into whether or not my 147's carb is saveable.
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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)