Man I'm sorry this happened to you and I hope Kevgascan makes it right.
One thing is for sure, if he doesn't make it right, I would expect the pinball community to completely shun him. Never let him show his face at events, buy/sell machines, etc... He will basically have to (rightfully so) give up the hobby and go into hiding, all over less than 4k.
Kevgascan, make it right and you will be forgiven. It's not worth giving up the hobby of pinball. I don't know you, but sounds like others have had fair dealings with you so I'm assuming you are better than this.
Do the right thing!...please, a huge part of why I (and others) love pinball is how great the community is, don't be one of the bad guys to spoil it.