Adjustable Hole Cutter

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It's expensive but this (http://www.screwfix.com/app/sfd/cat/pro.jsp?ts=23964&id=10399) could come in very handy for you serial modders, cuts any diameter from 30mm to 220mm B)

[richman]

Dad has something similar to that, which he borrowed :unsure: from work. It cuts your case like butter but if it slips of course the top of your case is a gonna (or will need so TLC)

Richman