I feel your pain. I went the cheap rout and replaced all the buttons again and sanded the helix smooth. We will see how long this lasts. As for your mounting bolt I’ve never had that happen however you mentioned earlier that you had the driven off a few times maybe the bolt got fatigued from reusing it. The longer the bolt the more fatigue. If I lose another button I’m going to a different style clutch with rollers. I preloaded the green spring 1/3 rd of a turn and it works good.
What it lacks in ground clearance it makes up for with traction.