Precision hot glue gun

Step 7 The pen-type version: how do you hold it?

I cut up a Dalsouple rubber hot drinks coaster* to make finger/thumb grip plates, which I then glued in place around the part of the device which felt the most natural place to hold it, and wrapped it all in (yellow) duct tape to make sure it stayed in place. This provided a degree of immediate thermal insulation, such that even when the device had been plugged in for 15 minutes or so, it could still be handled without getting burned.

(*well, it may have actually just been a small sample of one of their floor tiles, but I've been using it for years as a coaster - it's a good move giving that sort of sample away to students!)