RE: Sig Wonder Designed by Bruce Tharpe - 2nd Build
Could be, Tilaco.
I did the division and 2 and 3/8 C.G. is 25% of the 9 and 1/2 inch chord. Kind of in the middle between "conservative" and "wild". Sig says in the instructions that it's not wise to get further away than 1/16" from what they recommend.