Is it still slated as a Euro or will it be a cap? If too many peices are not lost a good glue can hold the puzzle together. I have had a couple where too much bone was gone to piece it together. In that case I will trim around the antler base a bit and carve away a piece of Cedar or Basswood to mount the antlers to, I do the same for the cast antlers. It takes some fiddling to get it right.