Ti2’s spring is silver.
Total coils of 5 including concentric flat-top.
Coil thickness is 0.60mm.
Stock coil height is 10mm.
PS. Both Ti2’s have that biggish black chip mentioned above in the OP with the “F” imprinted on top chipped at the corner essentially. It’s a big enuff chip that you can see the toroid-like wound wiring.
I think it’s a combination of me extra-torquing the head to get it to work and the coil cutback allowing contact. Butt like you said it’s a concentric spring. (???)
When you turn the head on the fixed ones it rotates down easily now so that it’s almost flush (about 0.25mm gap) with the tube step - the way it’s supposed to be. Before, there was about a 0.50+mm gap - even as I’ve said when extra-torque was applied. That’s when I’m pretty sure I did the main significant chipping on that “F” component, confirmed by the “krik” sound. :laughing: