http://www2.towerhobbies.com/cgi-bin...?&I=LXB943&P=V

I will be using the above adapter for a Dave Brown Spinner going on a Saito 100. It is a one nut design, after reading this post I am now having second thoughts on how safe the design is. If I use one of the original nut as the first nut, I don't have enough room for the spinner adapter. However if I use the locknut that came with the engine I have little but enough thread to screw-in the adapter.

Any recommendations please, before I fire this baby up....

Added links to adapter.....

http://www.dbproducts.com/