Steve, Just as you thought that is not the correct spring. The correct spring is shown in the picture of the lifter's above, 'V' shaped wire. The coil spring should work if it has enough force to push the cartridge up into position.... if... it will still easily compress enough to allow the center piece in the lifter to move down as the bolt goes forward - this might be the problem, it looks like there is a lot of spring there going into a small space inside the lifter and the slot is only about 0.045" wide, so I don't see how that spring fits at all. The inner part of the lifter should swing down inside of the lifter body just as far with the spring as it does without - that leaves about 1/16" of the rounded top sticking out. If it doesn't move down that far without to much force it would be putting stress on other parts and could cause more issues.

Took some pictures while I had a gun out -

[Linked Image]
[Linked Image]
Here the center piece in the lifter is just starting to be pushed down by the bolt as it moves forward,
the pressure of it against the bottom of the bolt is what moves the lifter down when it is released.

[Linked Image]

Last edited by GeneB; 09/07/18. Reason: added note under picture