Problem with that is, the plug that they came with has a bunch of deep slots in it so that it can be held in place with a cotter pin, so that it doesn't fall out. It just sits loosely in there, you don't tighten it against anything, so the cotter pin is needed to hold it in place.
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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)