[Dark Skies]

You should use it to make a simple adjusting tool for when you need to replace / adjust the speed sensor.

Here's how:

http://forums.pelicanparts.com/showthread.php?threadid=98754

There's a metal insert with a tightly coiled copper wire in the stainless tube and a permanent magnet in the plastic body - they make excellent bolts pickup tools if you glue them into the end of a piece of plastic washer hose You'll be glad of it if you ever have the misfortune to drop a bolt in one of the little holes (huge holes when Mister cockup pays a visit ) next to the sensorts.