We are talking Mag C, D, and Elephant size tubes. I don't think $13.73 for a brake hone is too high of a price to get it done....but if you prefer a sandpaper technique, go for it.
Price was irrelevant to me, I have not tried brake hones , but inspired by fishx65's thread , I bought 3 sheets of 80 grit wet and dry. I used about half a sheet , could do it with a third next time.
So many times I have attempted "bush mechanic" techniques, imagining the possible results beforehand then wanting to bury the finished product.
The drill press/ 80 grit wet and dry 6P experience was unbelievable. Far better than I imagined.
A little time consuming, but easy. I spent about 5 minutes cutting small pieces of wet and dry off my "rig" until I could just squeeze a small piece into the light. Then another 5 minutes turning the drill chuck by hand to get all the way in. I accidentally lost my grip with the drill on , lost a couple of heartbeats , but then just laughed as the 6P just sat there spinning like it was mounted in a lathe. As the sandpaper wore , I'd cut a layer off and insert some thin cardboard to increase the diameter.
Using good quality tape , the sandpaper did not detach for the whole job. I did not use any fluid for cooling or lubrication.
It took about 30-40 minutes all up. 10 of that would have been waiting for the tube to cool, I could only find thin gloves. Due to the very small margin of error around the tailcap O-ring area on the 6P, I went very slow at the end, just 5-10 seconds of drilling with cordless drill at a time.
Better gloves, water tray so I can cool body without making a mess and 20 minutes should complete the job.
