I brought an old briot 4000 edging machine.
I drove 18 hours over two days to collect it and can't get it functioning properly so if anyone could help me i'd really appreciate it!

I have attached a youtube video link of my attempt

The lens doesn't rotate and just comes down on the roughing wheel which just carves the shape if the wheel on the bottom
of the lens.

Any suggestions would be greatly appreciated.

Thanks in advance.