For those on the cheap, I'm in the prossess of building the herr p-51 and was looking for something to use. I just grabbed a box of 3/4 plated coarse nuts which are square, heavy and sit on the build board.
I suppose if your building a bigger plane, you just get bigger nuts. LOL.

Barry.


(Ps: I'm new at building and flying and to fly a large plane would take bigger nuts!)