I'm working on my Rollei 35S A while back the lens front name ring went missing. I was able to source a new one, and upon looking through the repair manual I see that it is to be glued into place. There are three flat screw heads which hold the distance scale in place and that stick up providing the only points to glue the ring to. Looking in the service manual Rollei calls for "plastic glue P500". Does anyone know what kind of glue they would be referring to? I tried using Pliobond, letting both sides tack up real well before putting the parts together, but the glue doesn't hold to the screw heads very well at all. I Googled P500 glue and there is one that comes in a spray can and looks be a silicone adhesive for automotive windshields. Doesn't seem like something I want near my Rollei. Any suggestions?