I put my mrs car up for sale on the Sunday, guy phones about it Sunday night and asked if its ok to come see it Monday night. She takes it to work on monday morning drives it out the drive and the spring snapped. I phoned the guy and explained what happened and he agreed to come another night when it was fixed.
He was a time waster in the end but I was honest from the get go if something is wrong with it he should just tell the op.