I have recently gotten a a stealth cap and it seems that with the GGTS with serials 300 and below have different threading on the top caps, which don't allow the stealth cap to screw on properly. I alerted Bruce about the issue and he asked for my order # when I ordered my SSGGTS. A couple hours later he emails me a shipping tracking number for a replacement top tube WITH NO CHARGE to me whatsoever. Bruce and Imeo are truly a match made in heaven for us in this niche.