replacement operators for Marvin casement windows

Hello -- I need to replace the operator for 3 Marvin casement windows. In all 3 cases the handle has come off and won't engage with the mechanism, and in one case the cartridge (?) has come out as well. One of the windows is open and won't close. All 3 are horizontally-opening windows, i.e., they rotate along the top (horizontal) edge.

I'm a novice in window repair and a semi-novice in home repair in general, but willing to learn, especially if it will save me some money vs. having a window company do it.

I'm not sure exactly what parts I need, or even how much of the mechanism needs to be replaced. Any help you can give will be appreciated. Thanks!

45054

Hi Tom, I really appreciate your answer although I am just now getting around to trying to fix this. :\

How do I open the window frame to remove or examine the operator to make sure the dimensions match the one you linked to? I seem to remember you have a nice tutorial on this somewhere on your site but I can't find it now.

Thanks,
LS

Thanks, Tom -- but I'm really not sure which piece(s) I should be removing. Nothing has much give when I tug on it and I don't want to just start prying stuff up. Any suggestions?

I'm attaching a couple of pictures, including one from the outside. I labeled a couple of spots on one of them -- maybe you can use that to tell me which part to remove. Thanks!