Hi Jon

Here is my take.

I would offer my plane as is where is - faults disclosed for xxx dollars.
If you now make me an offer which I accept, based on the foregoing, I
would not look too kindly on a reduced offer because of a previously
disclosed fault.
However, if you discover a fault that I had not disclosed, then that
would merit discussion. It would not merit that I pick up the tab -
bacause we are talking about an old plane - you cannot expect new
replacements. If for example an instrument was in need of replacement I
may agree to pay up to 50%, but you are not about to get me to pay for a
new instrument.

HTH

Tony
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Tony Roberts
PP-ASEL
VFR OTT
Night
Cessna 172H C-GICE