I need to do this, I keep forgetting that I can't put GC carts onto my manual batts and every time I do, I think "what the H is wrong?? oh duh!" (exactly like when you accidentally hit the the numlock button on your keyboard.."what the H is going on???? oh duh!") anyhoo...I do have a dremel but I've really only used it a few times (other than for grinding my doggies' nails)... i'm a-skeered I may eff it up and damage the outer ring..not only of the battery, but possibly the whole stratosphere!! what type of dremel tip will work best?