How to remove drums with out destroying them???

Simple,
They are on LH threaded hubs. And I want to save the drums for my RH threaded hubs. I will never use the LH hubs. Thanks

The first question that came to my mind is.....why are you taking the drum off? If it's a good drum, leave it attached to the hub. If it's a bad drum, who cares if it get damaged?