Minor remix of "The Magic Magnet Tool V2"

The original design by @tjdesign is great.  The only change I wanted to make before I'd printed mine was to make the handles a bit shorter.

So, the only changes which this remix offers is that the handles are 20mm shorter.

I've also added a remix of the “C” shaft, with the handle being double ended so that you can make one side a North pole and the other as a South pole.  Just be sure to print two different colours of end caps so you'll know which end is which.

Shortened the handles and made one of them double ended.