[bunnyrabbit]

As for the serving separation, who ever built the bow string did not apply
enough tension before adding the serving. Crossbows with a narrow axle
to axle when cocked put a sharp string angle at the latches trying to force
the serving in that area to separate. Looking at your series of crossbow
on the internet, the bowstring comes down outside of the cams so one
will not have that narrow string angle as one where the bowstring comes
down inside the cams.
Check the hooks for any rough spots and if found, finally sand them.
The latches should be checked as well. Some latches are not smooth
and need fine sanding or polishing.
Wishing you all the best.
Take care.