An inventory revealed that I have one remaining 8 lb. stainless steel counterweight for the GT-1 mount. It is very similar to my L1-G11-7lb weights, but with a bore for the GT-1. I will not be making more GT-1 weights. This is the last.
Price $75.00 + 12.00 shipping in the Continental USA.
The photo below is for a 15 lb. weight with an Astro-Physics size bore, but it gives you an idea of how it is made.