you have to bring the RH(relative humidity) up if the MC of the wood is around 6 or so then you need to basically keep it in the bathroom until its gained enough MC. Restoring bows to working condition is ALWAYS a gamble. You have to work the limbs very carefully. Exercise them slowly, best way would be to exercise the limbs one inch at a time, 25 times at the lower inches that your doing per inch, then 50 as you get back to farther draws. Always wear thick cloths and some kind of safety glasses. These steps as well as looking on google for restoring old antique bows would be a keep to your success.