Music Stand Clamp Knob

I was presented with a broken knob for the clamp on a music stand.
The bolt had broken out of the plastic.
Here is my fix. The hex hole in the knob suits the bolt head,. The hex tube slides down the bolt and these both are pressed into the knob.
I drilled the hole out a little to make the bolt fit into the tube easier. Superglue is applied before it is all assembled. This seems to work ok.

I forgot to get a picture of the assembled item, sorry.