The bolt is 8mm x 1.25. I made a drawing and posted it to the photos section of the DML Yahoo groups a few weeks ago hoping that someone like you with such a question would be able to find the answer through the DML's accumulated resources rather than asking the list. However, I went to find this so that I could send you a link to this drawing and it has apparently been deleted even though it was an incredibly small B&W .gif file. Go figure. Walt