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@vikingfixed
Not that tricky, actually.
Place the brake disc on top of the cog, taking care that the centres are concentric, centre punch through the bolt holes in the disc to mark where to drill the cog. I found it easier to mark one hole, then drill it, bolt the disc and cog together, then mark the next hole, etc, etc. I also used a bench-mounted pillar drill but I guess you could use a hand held power drill if you're careful, and it's all you've got. Also, use the best drill bits you can afford. I ruined several doin this.