Glad you stuck thru it to figure it out. In all my years of working on TX's I never ran into that issue!! So yes, us old dogs can learn new tricks...
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Interesting read, glad you fixed it and brought us along to learn.
So the takeaway solution is to check for a loose or overly tall flat head mounting screw for the stock bracket?
I know this is more than a year old.I can't speak for others, but my take away was
1. You can spend money on someone to "tune" your airgun or I could do it myself. It certainly takes some considerable time (at first) , and I have to overcome a steep learning curve, but it's doable.
2. Delrin can break, and when it does, it messes things up. I'm sticking with the original metal parts for a while. I may try it again at a later time.
3.As for the stock bracket, I thought changing it out (months ago) for a aftermarket was a means to avert future problems. After I had tried to trouble shoot everything I know/knew at the time I thought I would revisit it.
I guess the take away depends on the reader's skill and knowledge level. The author's skill/knowledge level was basically kinder-garden level when this first started. Now, I'd put myself smack dab in elementary school. I potentially could I have saved myself quite a few days of angst by checking that first, but at the time I thought I had "remedied" that long ago. And, prior to the delrin breakage, it was working, although the safety engagement was hit or miss.