traditional “plug, drill and ream” bushings as well as
Open glue seams
center seams in both backs and bellies.
Heavy re-touches in cases of extreme damage, matching color as needed.
Complete re-finishes, in cases where someone else has stripped all the old finish off.
Using traditional oil varnish, and spirit varnish
Shorten ribs at the endpin, and re-fit the plates, in a case where there is missing wood from the center seam, and the whole instrument ends up a few mm narrower (Not something usually done, but still can happen.)