How can i relocate the combination on my sentry 1250 undamaging? ...

I own a 3ftx3ft "bubble" below shingled roof....
Answers:    These require an access code to change the combination.
If you do not own the owner's manual, you will hold to call the factory for assistance.
Free heaters?
It may not even be possible... Sentry's are cheaply made safes. There is, or should be a code on the side of the undamaging. You could call the number and present them that code... pay 15-dollars and they'll distribute you the information to help. Otherwise you may enjoy to purchase a new locked... as persons who hold that kind of information more than probable wont give it to you as their own work security.