Magnetic mini screwdriver handles

It's often necessary to use a screwdriver in a very tight space and normal handles are just too big to fit and there's not enough torque to be had in tightening the bit directly by hand. I have seen a number of small printed handles but these don't hold the bit very well.

So, I have come up with a magnetic version in which the bits are held well, so that they can't fall out.

My plan is to grow this library to suit specific requirements, so if you can think of a shape which would be helpful, please let me know in the comments.

Fitting the magnets can be fiddly so I have also produced a tool to fit the magnets to the "handles".