I've enlarged 2mm of the mounting holes of the aluminium bar for mounting the DEC arm. By doing that way, the head of the mounting screws could sit all the way into the mounting hole for shake free and more secure connection.
Previously, I found that the DEC arm was loosen a bit after several operations. I suspect that's the reason behind is that the mounting screw was not getting all the way inside, now the DEC slow motion control block got a few more turns of threads for fixation and the mounting screw has less room for shaking as well.
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