I recently perchased a "Polar" Bear bow from an antique shop. It is in fair condition with two small cracks in the belly glass running long with the riser. Leather on the shelf and handle in good condition and no other real goods or bads. It didn't have a string at the shop so I bought it and made a string and strung it up. Its slightly out of tiller, shoots ok with very mild hand shock. Being that it is a glass bow,recurve, is there a way to treat the tiller back with heat, wet or dry, or any other methods. Any advise will help, thanks