Colin
I would like to have a go at doing some piercing. I only have a dremel and trials with that have not been so successful.

Researching this I have seen comments about using high speed dental drills to do this with. Searching on my favourite auction site there are loads of them at very reasonable prices.

Before I buy one can anyone tell me how to connect it to my compressor? They all seem to have 4 connection holes, presumably water in and out and air in and out. Do I need the water for cooling? or just accept that the bearings may not last.

Any advice would be most welcome.