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The way jcart explained is how you would do it without the gun. I just got lucky and we have all the tools at work, being a sheet metal fab shop. The factory bolts are m6x1.0mm thread. I either went to 25 or 30mm long bolts to replace the shorty's that must be about 16mm. I wish I would've went with thicker UHMW but had all the left over of the 4'x10' sheet of 0.25" from making my roof so had to use it for something. I went back and tested mine on the same hump I got high centered on to start with. The washers took a serious beating but held up. Maybe down the road if this 0.25" skid craps out I'll buy a sheet of .0375" and counterbore the washers, but that UHMW is some tough stuff..