Right! That's what I was wanting to avoid, the thrust button. I knew the cam sprocket would need clearancing. I was just wanting to figure it out now, even though I'm not using a roller yet, I may want that option down the road. What my thought was, was to clearance the cam sprocket more than needed and have some shims made so that I could adjust the end play as needed, as each cam core may be a little different. Heck, it might not even work, but I'm just spitballin. lol