Hello H.,
You forgot to them give them a "lifetime warranty" and beg them to take it off your hands. LOL.
Trying to sell used equipment has become a real challenge these days. I take cash only, no check and no credit cards. Sales have been slow, but I tend to be strict about asking potential buyers plenty of initial questions.
Also, a customer is required to run all equipment and mow or weed eat with it on my property before I will even sell it to them. That is their warranty in my opinion. Anything beyond that once it leaves is on them.
Also, I do not sell anything on Friday for a "special event"!
They will always show up after the event wanting their money back after they have beat it to death or broke it. As soon as they mention anything like that, I refer them to the big box stores if they want to play that game. Finally, the big box stores are becoming wise to this game and telling them they have to take the equipment to a recommended warranty shop.