Since I retired I've had the invitation to help in a bike shop once a week. Financially this has meant a simple cash cycle where I earn a bit and spend it back into the shop! But, it's fun, it seems to help a friend and I'm learning stuff. Including how to use this odd looking gadget.
We call it the rocket. Regardless of what you thought it could be used for, it's for knocking out bearings from headsets and cranks.
Taking a lump hammer to a tool on my precious mountain bike took a bit of courage, some advice from my cycle engineer friend and I watched a few YouTube videos. Then, one firm smack with the hammer and the bearing was out.
Now, of course, it's just a matter of finding the right replacement and being able to fit it. Simple, yeah?
This old dog, is having fun learning some new tricks.