I have found the loose bushing issue with mine in the past. I used a bit of teflon tape and when I screwed it back in made sure it was secure. Haven't had the issue arise since.
I also addd in a spring washer between the adjustment nut and the bushing on the stem. THis makes it a bit more secure and easy to adjust the stem without having to loosen and tighten the ring every time. Simply loosen the ring, tweak to the charge wanted and tighten. More or less it acts like a lock washer.
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LAter,
Mike / TX
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