Step 7: Tap in Dimples into the Paper-Towel Holder

Picture of Tap in Dimples into the Paper-Towel Holder
This is the other half of the "needle bearing" I wrote about. You'd need to make this deep enough so that the turbine stays in place but not so deep or so narrow that friction becomes a real problem. Some suggestions:
- with a hammer, tap each end with a small blunt nail followed by a phillips head screwdriver
- don't make a hole, just a deep dent
- test the mechanical action with your turbine frequently
- add WD40
- adjust the height of the nails if there's not enough or too much pressure on the turbine (i.e. it keeps falling out or it's stuck and really slow)

Once satisfied, glue down the corks to the CD
nerdyH4 years ago
A solvent like wd-40 might be good for flushing away metal dust (say, from aluminum nails). But, I wonder if needle bearings like a little bit of grease, the way so many other types of bearings do?