Riser crack

[Bodork]

What causes a riser to crack at the arrow shelf? A takedown I made for myself has developed a crack at the belly side of the arrow shelf and I'd like to know how to prevent it in the future.
Thanks! Mike

[Crooked Stic]

Pictures always a help. If it's where the shelf and window meet then could be not radiused etc. Could be bad wood stress over time etc. I have fixed a few with water thin CA no accelerator and let it wick in. Don't always work tho.

[jess stuart]

A good radius is critical in that area.  I have usually cut ou a crescent and fit a replacement piece in eliminating the crack.
Haven't had one in sometime now.  Mocking on wood

[Bodork]

Here is a pic. The crack is directly above the deepest part of the riser in the arrow shelf. The wood is dymondwood. The shelf has a radius. Is there somewhere else that needs a radius?