need new window crank mechanism

Hello,

I have a casement window with a worn crank mechanism. I can open the window with the crank all the way open, and then can get it about 2/3 of the way shut with the crank, but the last 1/3, I have to use my hand to pull it in as I crank, after taking the screen off. Needless to say, I don't really open this window anymore. The crank mechanism slips during the last 1/3 of closing, like whatever is going into the gears is soft and not locking into the gears.

The window is a K & C 213-K-012. I wrote K & C about a replacement mechanism and didn't hear back. Wondering if you have something?

It looks like one of your photos. Maybe the 39-253RB.

Any help with be appreciated, I'd like to avoid replacing the window, it's second story in an inconvenient exterior location.

Thanks,

Robert

Thanks for the info. It's definitely a Truth mechanism, I uncovered the branding under grime. :) The track slider is very small, with a little metal tab sticking out. It doesn't look like like there's an offset with the slider, like with the low profile version with the rectangular slider, so it sure looks like the non-low-profile version. How does that slider detach? Do I grab onto it with some pliers and pull down gently? And how do I get the pin out where the 5" arm connects? Maybe a small hammer and a nail set?
Thanks,
Robert