Jamar line lock removal

[WACJ5]

I have a Jamar line lock in my 56 CJ5 which is not properly engaging. Thought it might need a little TLC, so I started removing it only to discover I couldn't get it out. Seems like the plunger/control will need to be removed and therein lies the problem. Anyone remove or install one of these lately and remember how they did it?
This has been a very useful device in steep starts. Would be nice to have it work again.
Thanks.

 

[Posi]

You have to unscrew the stem unit with vise grips.
There will be a couple o-rings you'll need to replace.
Make sure you clean out the block with compressed air.

 

[WACJ5]

Thanks Posi. It doesn't seem the plunger (?) goes in as far as it should because it won't stay engaged until I hit the brakes again. Even took off the O-ring wondering if it was distorted/swollen but it still didn't engage any further. It seems there is a hard stop. I checked the block, no apparent debris, removed residual brake fluid. Any additional tips? I ordered another one just in case, I'll put it on my RZR if it works again.