just picking up on a couple of comments in this thread
1) DO NOT use a drill without a clutch esp. when drilling large diameter cores. If the core binds then you run a significant risk of doing yourself a serious injury - a broken wrist is not uncommon.
2) If you are using any drill with hammer action, switch the hammer off when using a diamond core cutter
I've got a plumber coming round on Thursday who will do it for £15, think thats a bargain.
Sparky will fit it for £50 so it's gone from £120 from the sparky who let me down to £65 which is good.
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