Proof of sale / Guarantee

As much as possible!!! But be aware that a lot of dealers won't sign what you want them to sign. Are you having a 5 stage vetting?
 
* Vice free, inc windsucking, weaving, etc
* Good to catch, shoe, load etc
* Hacks out alone/in company
* Suitable for the purpose of purchase which is: ??????
* Price paid - so it can't be disputed later

A good dealer should sign it as they should be willing to take it back if it's unsuitable.
 
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