I seem to have luck doing it the lazy way. I drop the hearing aid battery in and screw the cap on. Bingo! No adapters, O-rings, etc.

According to my Minolta autometer IVf the SRT cameras are dead on.

I did have a problem on one SRT where the battery cap will screw in so much it interferes with winding to the next frame. Backed it off a half turn and everything is working good.