Unfortunately there is not always wood under the skin when you open it up... I don't understand why they can't put a few more inches of wood in there to make sure you hit it... They could add another 2 1/2 cents to price of the kit, and I would even pay a nickle !!! Ridiculous !! All manufactures seem to have this fobia about that.. It's hit or miss... literally !! All that hell raising being said, I just pack it with Hysol, put the arm in and position it whre gravity is on your side to cure.....

Good luck !!,

Dan