I thought I'd ask this question here as some of you may have given serious thought to this problem.
Refractors have a well deserved reputation for being able to maintain collimation decade after decade, even when treat relatively roughly. So why has no-one been able to produce a Newtonian primary mirror cell that can do the same? Lens cells don't pinch or put pressure on the optics of even large refractors, so surely it would be in the realms of possibility to manufacture a refractor-style cell for a mirror? Has anyone been successful in doing this?