Here is a great little home made jig for checking and setting the "Center of Gravity" on any modle airplane. It is very cheap and easy to build. This tool can be used on any type of plane and wing configuration. There is no need to invert the airplane or mount it dangerously on one of those teeter-tooter type devices. Notes are provided on the photos on how to build and use this tool. One of the great things about this tools is that there are no weight, size, or configuration limits for it's use.

I have lost the address and name of the author but would like to thank them for this great information..