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Antler repair of cracked or slightly chalked antlers is very doable just takes some time and playing with to figure out what works the best. I would suggest finding some small deer or elk antlers to play with that are in similar condition so that you don't screw up the ones that you want to turn out nice. The first thing I would do on any antlers like this is clean them really well. Once they are clean you have to seal them so that they don't soak up all of your stain and turn way darker then you want. This can be done with a lacquer. Once you have the natlers sealed then you can slowly work up to the desired color with different stains. This all takes some time and playing with to figure out what works best so definately try to find some other antlers to start with.
Thanks Adrenalin, but no big secret. Feel free to share, but it's kind of hard to explain without just showing like we did. Especially when the antlers are as dried out as yours were. Just got to be real careful not to get them to dark.