Gun Stock repair

Hello everyone !!
I have posted this same subject in another area as I didn’t really know where I should post it and really am just looking for help . I have a Ginb Gun Stock that I need repaired from me trying to sand the inside where the air tank goes to make it easier to screw in the air cylinder on my HW 100 Air rifle . I butchered the inside and nicked the outside with the high gloss or gloss and there is a crack in the fourgrip . I don’t really know if anything can be done with the crack in the stock . I’m looking for someone who does Gun Stock repair and if anyone knows of such a person if you can direct me in the right path I would greatly appreciate it .
Kind regaRDS, Robert