Some thoughts on my first 82104A repair

[Johnboy]

I've had good success with silicone tubing that has slightly oversized outside diameter. To avoid the concentric issue, and to "mill" the tubing to the correct diameter I use a drill press. Using a Dremel like mandrel, I slip the tube over the mandrel shaft and push it up to the drill press chuck. I do put a o-ring between the tubing and Dremel mandrel head for grip to make sure the tube spins with the drill press switched on. That setup holds the tubing firmly. I can use a box cutter to slice through the rotating tube to get and even cut for the length, and an emery board (nail file thing) on a longer piece of timber which I lever off the drill press stand to get a nice square/even grind/filing/milling/sanding of the tube. That method also leaves a nice grippy surface on the tube.

Cheers,
John