If you look again, you'll find that another forum member asked initially how it was held, it was your use of the phrase 'internal mounting colunms' rather than literally just showing a picture (which is worth 1000 words, rather than three) that intrigued me and hence, I asked for a picture, because I considered that the easiest way to decipher what you meant, how wrong I was.
To state that
concerning the negative feedback is also debatable, I would consider the same seller a fairly significant 'connection' and your explanation below perhaps explains why the buyer felt they needed to leave -ve feedback, as it is somewhat confusing....see belowThis product had no connection with the Pi-Stack in any case.
what is meant by
The customer received an immediate offer of a full refund if the item eventually arrived
my understanding of that is that 'if the product he paid for arrives, he will be given a refund.' I would expect the opposite, as in, 'if the product does NOT arrive they would receive a full refund'????
Feedback may not represent the quantity sold(your feedback left for others does however ), but it represents the quantity of people that are happy enough with it to tell you so. My point was merely that using ebay feedback as a measurement was hardly conclusive, you have infact reinforced that statement, noting many of your customers don't even bother to leave any. ( I expect they are all the happiest ones ) also suggesting ebay isn't the only place to buy them from is bizarre, because you specifically mentioned you could only get them on ebay and havn't told us of any other retailers, I suppose, like the mounting columns, we should have just known that it's available elsewhere?
Anyway, thanks to tsedlmeyer for actually taking some pictures and providing what I asked for, such a pity the OP took the tone they did when we were simply asking genuine, reasonable questions.