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I finished the rebuild of my RC10 A stamp and the final piece of annoyance has been the top shaft nut clamping nut. The threads on my original are all boogered up so I seach for one on flea bay. I get one that the sell claims he threaded a nut on before he sent it. I can't get what I assume is the correct nut, a 4-40, to thread on the shaft. The threads do not look perfect but do look useable. After firiing off a nasty-gram the seller politely tells me the nut is something odd-ball like 5-40. Is this true??? Why would this shaft be such a crazy thread, and where do I find the nut?

it's a 5-40.

http://www.amainhobbies.com/product_info.php/cPath/1_25_1450_42/products_id/8005/n/Team-Associated-5-40-Slipper-Locknut-6?utm_source=Google-Base&utm_medium=cpc&utm_campaign=Product-Feeds&source=google_ext&gclid=CPqVz9DVlLMCFUWo4AodalMAhQ

Pm me your address and I'll send you a couple. They are cheap by the 100 from McMaster carr

This isn't a sale...its a freebie

Thanks guys! Now only if I asked that question before I purchased the new top shaft...anybody need a top s haft?!