Just got though installing the Idler pulley on the F3T. Most will likely use Lamont's video to see how to do it the easy way. I found I needed to be able to hold that bolt in the socket while installing in the threaded hole. I use a piece of paper towel to capture the bolt head in the socket while I drop that extension and socket down about 8". Note the picture below.
Buckskin

Buckskin
