Got back to this today. The spring is straight and ends square but not polished.
Measures 253 mm x 20.8 OD x 3.25 wire. 31.5 coils 36 lb.f./inch rate.
Anyone know if that's original spec.?
Seen the data thread which suggests square sec./Ox
Thanks for looking.
P.S. Titan 1 is reasonable fit and will give the power with a bit of shortening for .22