Hi Logan,
Optimal scope performance does not require "Precision" centering of the Primary in the tube. If you are "careful" with your hacksaw to cut the support arm lengths to within 2mm shortest to longest, you'll be fine. I'd be more concerned about having enough clearance inside the tube for the mirror-support assembly arms and whether or not the clips will keep the Primary secured. What size mirror is the cell designed for?
Regards,
Jim Fly
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