Gauge renovation

[Myumi-2]

The Spedo and Taco on my 1972 CB750 are reasonably dirty on the inside.

I pulled them off last night to clean the glass lens, however, I can not work out how to get the apart.

Ive got them off the bike, electrics disconnect, lights removed and they are sitting on my work bench.

What is the trick to getting to the glass lens?

Cheers
Tim
 

[cb750k4]

you have to cut the bands off with a rotory tool and then put them back on with a dab on JB Weld over the seam and a hose clamp to hold it untill the epoxy is set. At least that is how mine work. Here is a link that may help you out.
http://www.cb750cafe.com/parts.php?id=5
Good luck with this job I have not done mine yet so how well it works is all theory.