Got my mothers Rollei 35 some weeks ago. It lacks the battery cap (it is 29 years old...). I can use it without batteries, but I thought it would be a nice touch if I can get the exposure meter to work. I know I shouldn't trust an old CdS meter, but it would be nice. My first plan was just to ram the hole full of tin foil or something more practical, can anyone who has one draw a sketch on how the contacts in the cap looks like, where do they go? Or better yet, if it's a standard thread on the cap, maybe I can do one myself? Or are there replacements available?