the side pressure gets my vote as cause of the cracks. i have a 55 F in 250-3000 that never had a crack until i had to evacuate last year's forest fire. even in a soft case somehow it got pressed and cracked. very fine crack but there.

the consolidation of the states into one vast republic, sure to be aggressive abroad and despotic at home, will be the certain precursor of that ruin which has overwhelmed all those that have preceded. Robert E Lee
~Molɔ̀ːn Labé Skýla~