If you have cracks or splits get Cascamite glue, comes in powder form and just add water to a paste, slightly ease the crack just enough to squeeze glue in, as crack closes wipe surplus off with a damp cloth, rap masking tape tightly a couple of times and leave to dry.
Depending how much glue you have used you will have to balance the prop.
You can use PVA glue aswell for smaller cracks or splits, the joint will be stronger than the wood itself with both these glues,