> Also, perhaps people here can answer a question that has been vexing me recently - what is a suitable number of times to try contacting someone about their order payment and what is a valid time to wait for an answer before assuming that they are no longer interested?

Hi PCA, I am one of those people that never responded at one point. I was thinking about getting a spare tuner, but I never even use the one I have right now; I haven't even switched it on for something like 3 months. I apologize for not sending you anything back, but I check that email account so rarely that by the time I see your email it is so late that I figured it was too long anyway. If I had known it was vexing you I would have responded anyway. You gave me plenty of time though, i think it was quite reasonable, even excessively nice.