[gregbradley]

You must be an engineer Brendan.

I did not fully follow your post. Do I have it right that the problem is more a twisting rather than a bending issue?

When I said strength or way overstrong I meant in all ways not just bending. So yes I see thicker isn't necessarily the only strength
vector needing to be allowed for but twisting and even shrinking and expanding.

For example my TEC feathertouch focuser has an eyepiece holder which is strong. But if the temp drops it loses its grip!
Found that out the hard way!

Greg.