I have a 17.5" Astrosystems spider available for sale. It is in very good condition, though it could probably use a touch of paint in a couple of small spots. I don't think that I have the original mounting screws, but I'll check; these are just 10 cent items at any hardware store though. All welded design that takes a 3/8" secondary holder post. $30 shipped in ConUS or Canada or possible trade?