OP
Lazlo
Cut 100mm access holes to ceiling with hole saw to either sides of joists, mark the discs you have against the holes so you can get them back in alignment (plaster is not as even as it looks), look at joists and feel them to make sure there are no cables clipped to it or pipes, then get your long spade bit and drill through joist from access hole, feed cable though, get timber batten about 300mm long, place up into 100mm holes, screw through plasterboard ceiling into batten from either side of the circular hole, then hold disc up against batten and screw into batten bridge across hole. Get your easy fill 45 out and get filling.......
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