Jim - I could see the crack in the first pic too
Thanks again for the pics!
My 0.05 worth - that really is too thin of a wall at the screw head IMO. Your idea of extended the top past the side of the block would help. Now this is just me - but they could also simply
not countersink the screw head, as in this case I don't see any real issues that would be created. The other comment regarding what I see is the way the side appears in those pics, it's irregular - almost looks like it was cleaved (or maybe milled incorrectly), and then not stress relieved to reduce the propensity to crack.
Other comment deals with the m/b mounting holes - if it twas I, I would open the holes in the top up and use a shouldered sleeve so that you were applying the mounting pressure
directly on the (flat, metal) top of the block - to prevent compression on the top, possible gouging of the top, and provide a uniform, set, controllable (precise) height for the mounting force to insure level, uniform pressure on the core. (the top shoulder of the sleeve would become the spring seat).
Oh, one thing too I noticed in your first pic Jim - and it may be an artifact of the lighting and pic resolution - but it looks almost like the end of the central "rib" is chipped out at its base. (??)
Jessm - sorry m8, didn't mean make the entire block out of mylar - just the use of mylar
film to address the issue of resistance to solvents (depending on where the issue was). And yes - it tis hard to get good info from salesmen, lol. To get past the sales people and get reliable info, raise detailed technical concerns and get directly to their applications engineering people
