Thanks Danny and Mick!
I just took Ed's advice and had a practice drilling of holes on the cover I threw away, and without too much care, drilled 5 or 6 holes in it no problem, and this was done in just a few seconds, as I wanted to see what could be done!
So I'm not sure what caused the cover to split in the first place?
I will have to go cap in hand to Chris yet again!
It seemed to me like the cover was under "tension" and the hole was a good excuse to let rip!
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