Hi Greatreearcher

Well nobody else has waded in so I’ll make a few suggestions, although you may already have considered these.

Are these factory or homemade strings, were they made from the same batch of material.

Where did the break occur, are there any sharp edges on the nocks.

If the string is homemade check that the individual strands are under the same tension to ensure that the load is being evenly distributed over the whole string.

If the original string is still available check to see if it shows any sign of abrasion relative to the bow.

Just might be worth asking your friend if he has any rodent’s lurking amongst his archery gear, found one at home amongst my loading equipment.

Good luck and let us know how you get on, Mark.

Greatreearcher

You won’t effect the tiller by cleaning up the groves in the nocks, try a leather lace coated in polish the kind used for polishing chrome on cars. Put the lace into the grove and use a sawing action, just a little at a time you don’t want to cut through the varnish.

Although speaking the manufacturer is a sensible thing to do especially if it’s still under warranty.

Mark.