[R-390] R390A qvs vu meter mod 150 type 8 repair

[Larry H]

I have the subject meter that is a little sticky, but works other than that.  I'd like to repair it and looked in the pearls, y2k, and this forum for some assistance, but could not find any for a qvs inc meter.   I'm having trouble disassembling it.  I have the rubber ring off of the bezel ok, but it looks like there are 4 hollow rivets (1 in each corner).  I tried unscrewing them and applied quite a bit of force, but no luck.  I tried pressing them out, but also with no luck.
Has anyone opened one of these up?  Can you give me some guidance, please.  Thanks.
Regards, Larry