Yeah, I'm familiar with the nautical thole pins, but I think a scythe might have a thole, too...

Lemme go check onelook...

Edit: Actually, now that I think about it, 'thole pin' is kinda like saying 'pin pin'--but anyway, look down the definition of 'thole' to where pin is used as a definition--I expect that the scythe probably has a pin on it that was referred to it as the 'thole'--but I'll keep on onelooking...

Function: noun
Etymology: Middle English tholle, from Old English thol; akin to Old
Norse thollr fir tree, peg, Greek tylos knob, callus
Date: before 12th century
1 : either of a pair of pins set in the gunwale of a boat to hold an oar in
place
2 : PEG, PIN