The connection ring on our letus adapter was glued because the screws we're stripped and it kept coming off (I know probably not a good idea, but we were not there to tell that to the person who did it). We have to get it off because there is some condensation on the inside of the achromat lens. Do you know of anything that we could possibly use to get it off/dissolve the glue without damaging the anything in the adaptor?