Take them apart and use the lens to fry ants in the sun like we did with a magnifying glass as kids? What... now one else did that?
I had one that my gamo break barrel killed, I kinda got mad and took it off and smacked it off a desk. It started working so it now sits on my sub 6ftlb breakbarrel and holds perfect zero.
Always keep a few handy ones around.....Never know when the Mrs. is gonna need a whooping!pv