My best friend is a taxidermist and Iv eseen him fis tines that are broken, first off you need to have another shed or antler you can cut up, find a tine that is similar in color and size to the one your fixing, the closer the better. Cut your broken tine off so that it is a flat base as close to the break as possible, and do the same with your repair tine and try to match them up. If possible try to bevel both edges at a slight angle so when they are connected you have a little groove around the repaired place. Then epoxy the two peices together and try to line it up so it looks as good as possibble. The taxidermists have some stuff called antler paste and then fill in the groove and smooth out the repair, and maybe take a needle and lightly put in the scratches that deer naturally have on their antlers. When it all dries he airbrushes in a little color to match the rest of the antler. Agood taxidermist can make it look so natural that you wont be ableto tell it was repaired. Id say if you want it fixed, fix it,, It is yours to do with what you want to.