With narrow cracks, it's impossible to get the glue to work into the crack fully. I've used superglue (thin) with great results. It will flow into the crack & then clamp. I picked this up from guitar makers repairing thin cracks in guitars. I use 3/8" surgical tubing wrapped under tension to pull the crack together. Sometimes wedges on top or bottom, under the tubing if the surfaces are uneven to keep the cracked pulled together at the correct angle.
Most of the time the inleting is too tight & causes the wood over time & recoil to split. After gluing check the inleting & if too tight re-inlet.
Filling a crack with glue & sawdust is a poor repair & used by amateurs. If it's so large that you can't pull it together, steam it & pull it together & clamp & let dry, then follow the above.
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