you could cut a 3/4 strip out.around the split. and glue strip's
in side and then replace that section using epoxy or carpenter's yellow glue on the out side repair.as mono Cote dose not stick to cynot fast glue's.l
here is a trick i use for cutting hole's threw sheeting for repair's. i bevel the side's with my exato knife \_____/ <repair hole
replacement piece >\______/ put a strip in side at each end and glue edege's sand and finnish