hi all im a newbie im currently finishing off my yb 1oo could do with some help i have come across a thick odd shaped washer/plate left in my tin from my yamaha i have no idea where it goes and nothing resembles it in the haynes it has a u shaped cut out at one end 2 square shaped cut outs and a hole through the middle can anyone help please

Greetings buster and

Hi buster " , picture of said part , would be helpfull ,,,

will try and get one on the weekend