Firstly thank you all for your replies.
The tuner is replaceable, the twisted neck isn't. Return it and get your money back.
the twist in the neck is a non issue, I cannot see it and the action is completely acceptable. I only know its there because the guitar tech told me, and that he felt the action is higher than he would like for a set up.
he also has suggested that the twist may be from having it stored with the top strings under tension and the E string slack in which case I can store it with the
E and A under tension and the D & G slack which will likely pull it back.
99% of its job is to hang on my wall and look purty so I can easily do that.
There should be no reaming required to replace the tuner. It's likely a Schaller M4 or Gotoh GB7, possibly stamped "GIBSON" on the back. I've got a set of (4) black Schallers that say Gibson that I've been thinking of selling, but they are for a 2+2 headstock (came off my Les Paul).
unfortunately its neither a schaller or a Gotoh, both of those have a 14mm bore and the bass has a 13mm hole.
also the ears for the screws are in a totally different place
where are the ears on the gibson ones your thinking of selling and what is the bore size?
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I'm thinking of offering the guy who sold it the choice of full refund or I keep it and he refunds me £300 (I paid £1700) to cover the cost of repairs and decrease in value to restore it to Good condition
I also don't think that one replacement tuner is going to affect the value of a '93 TBird in a relevant way. I for one prefer working non-original to non-working original.
replacing it with a different tuner that will require an extra hole or reaming will surely impact the value won't it?
bearing in mind that I talked the wife into swapping a krugerand from our savings for it on the grounds that it is an investment and should hold its value