The threads affect it a little. You can get a bigger gain by adding/removing washers from behind the heims. There are two washers to start with. One has a groove for the booty to ride in. I find all the booty does is hold the dirt in so I remove them which then allows removing both washers. I removed both on my own machine to aid turning. That was a long time ago. Now that I have the long travel front, I probably should experiment with putting them back.