Hi my name's Tyler. The short version of this is I know this is a power tools forum but I couldn't find a better forum for this question. I need to replace a part but I can't find the part online because I don't know what the part is called. Figured people on a power tool forum must be pretty handy and would know what it's called. The part I'm talking about is this little wedge/cone shaped thing around this bolt. I can still use it right now but I'd like to get a spare for when it eventually breaks. I don't need to know the size, I'm sure I can figure that out myself. I just need the name of the part so I can find them. Thanks a bunch in advance