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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Just wanted to report that I came across the same issue.
Bent an allen key trying to remove them, but managed to get 3. The last one rounded off, and had to hammer in a T20 Torx bit, and used an impact gun to remove it.