I am buying new blocks for a WC system I'm building. Thinking of going with DD blocks. I had a lucite top crack on a WW I had... and swore I'd never go with a clear top again.
Usually this is caused by overtightening barbs and screws as well as using metal barbs. Teflon tape also leads to cracking poly tops. The best way to secure a waterblock is to gently hand tighten the screws to the point at which the o-ring is fully depressed. Put goop on the barbs and hand tighten them down. Dont use metal barbs on a poly top.
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