What fuel were you using?
I have a ST G75 with a ring and it was stored for 7 years with only a squirt of afterrun oil. I use 10% nitro and 50/50 castor mix at 20% oil content.
My engine was tight, but after a shot of Break Free CLP and rotating it by hand and then with the electric, it started up just fine. I thought that the ring might be stuck after that abuse as I did not intend to store it, just happened when I moved from California to the Yukon.
Glad to hear you can get it fixed
Richard