Use a compressor for added air. WHOOooooboy.
When you weld the line to the air connection blower/duster use at least 2 metres for the addition to the duster tip, you want to stay at least that far away when you stick the "wand" in the hole and zap the air in. Go with welders gauntlets not fabric and neoprene/ polyester work gloves.
At 1 metre I toasted off a LOT of split ends, and my eyebrows are no longer bushy at all. I even have a rosy glow to my forehead and cheeks.
I've got 1" close nipples, I used a 1/2" shank 10 Step Irwin Unibit, drills from 1/4" to 1 3/8" and a 1" close nipple just fits, with a bit of work. I'm hoping that is enough air going in.
I tried a bimetal hole saw and snapped off two bits, then went and bought the Unibit pricey but worth it. I'm looking now at investing in a knockout cutter if I can find one in the proper size(s). Cutting the air exhaust in the lid is now my next issue. I want at least 2".
If you don't have an air compressor a shop vac with metal extension and exhaust blow it might work. The wife just asked me why I didn't try that rather than lugging the compressor up the stairs and back down etc. .... Cuz you weren't home to tell me that dear.... The bruise on my shoulder will heal.
The End Of My Second Burn