I am restoring a 1978 XL100 and am making pretty good progress.

Looking at my speedometer, Single round unit, the inside face for some reason has mud or dirt on it. The outside is fine.

I want to pull it apart to clean the inside face.

Has anyone pulled one of these units apart?

It looks like the back and front are glued together, how do you separate these?

 Any suggestions would be appreciated.

Thanks