To patch or not to patch????
IMHO,,,a 1/2" gash would be the outer limit of whati'd repair,,,,
True the liabilility issue weighs heavy on most dealers minds ,,hence the almost universal mantra. "e don't repair /patch tires and tubes,,,,
FYI,,,we hardly ever patch tubes these days because it's not cost effective,, a new tube costs less than parts n labor
However I/we do not shy from patching tires,,,because I have time proven techniques for doin so,,the secret is using the proper type of patches,,we use what's called aT-patch. Ie it is a patch and plug combined,,,they come in various plug diameters...the plug plugs up the hole as well as keeps the patch from wandering ?..in case you installed a tube,,,patches on TT tires have a tendency to drift under the constant squirming/chaffing between tire and tube
Hope that clarifies things abit