If you are building for future plans which include running a high brushless system use .130 flex to a 3/16" stub shaft stepped down to 1/8"
http://www.offshoreelectrics.com/pro...od=oct-oc64pkg
You could make your own stut but I would recommend purchasing one.
If you make your own you would have to purchase 2 brass sleeves (technically bushings) that are ever so slightly larger than the 3/16" stub shaft. Then fit these 2 small sleeves (bushings)in a larger brass tube so that there is a small bushing on either side supporting the stub shaft and one long tube holding those pieces. Next you would solder on some thin hard brass sheeting to complete the strut.
Something similar to this
http://www.offshoreelectrics.com/pro...prod=sol-strut
Couplers
http://www.offshoreelectrics.com/products.php?cat=68
Ryan