Just started assembling my arm and when I got to the step to remove the backplate from the 23HS22- 2804D-YGS50-AR4 Gearbox, it seems that stepperonline have used a stong loctite. Were they supposed to? I was able to break 3/4 of them free and will have to come up with a plan B on the last one.
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I purchased mine just a few weeks ago, and the screws really were quite tight. I got them all off by carefully using an impact driver.