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thanks, Malcon and Ray.
Yes, I did, Ray. But, by the time, I did not find any block or tube to involve the screws and to immobilize them.
Despite of complication in collimation task, what I need test more accurately is the centralization of mirror inside the OTA, with the secondary mirror and with focuser.
I have not any better information up to now. The clouds do not let me do.
The collimation task might be a practice matter
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