I've been away from film photography for a few years and am trying to get back into it.

I have a Beseler 23C II enlarger which I bought used a number of years ago and have never set up, but now is the time.

While looking over the enlarger I am noting that I'll need to do a bit of cleaning, no issues there, but when I raised the upper housing to the 35mm level I found that the bellows is not attached and just sort of sits there.

What can I use to attach the bellows to the housing? I was thinking of using black electrical tape but that seems a little sketchy, is there some sort of magical adhesive that should be used?