Sentence:  ... as to a wheelbarrow, I fancied I could make all but the wheel; but that I had no notion of; neither did I know how to go about it; besides, I had no possible way to make the iron <WSD>gudgeons</WSD> for the spindle or axis of the wheel to run in ... 
Meaning of the word marked with <WSD> tags:  A type of bearing: a circular fitting, often made of metal, which is fixed onto some surface and allows for the pivoting of another fixture.