I have a 1957 Morris Minor, the rear end is rotted out of it, can I get the car rebuilt by a specialist and send the bill to Shanghai MG Rover or BMW (who has the Morris rights?) after I have got the work done without even asking them first?
The timescale isn't such an issue to me although it adds weight to the sellers side of course but that said a message like " Hi mate I bought the bass off you a couple of months ago but only just got around to using it and I cant get it set up right, took it to my bass guy and he says it needs a refret and it will be £230, what do you think?", I would still say the OP has no need for any involvement as it was a used bass but that should have been the first port of call from the buyer, missing that step out removes the OP from the situation 100%