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Hi MiG
The 3 'locking' screws you mentioned ,unless you've a different setup I presume your talking about the 3 that hold the dustcap on, are'nt.
I'm sure you could screw these in to take up the movement at vertical (if they could be locked) but in the process you've created a situation where you now have 6 screws to adjust for collimating. 3 to adjust to collimate and the other 3 to hold the weight at vertical. Any pressure on these last 3 will change the collimation again. Too loose and they'll eventually fall out.
Slice
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