encased window opener

I'm afraid that I can't ID what you have from this photo. Can you flip the operator around and show me a clear picture that shows the whole mechanism in one shot? Most of it is cut off in your current photos, but I have to see the whole thing in order to match it up.

It does, thank you. Please see our 39-031 and 39-032 operators. I think these may be just what you were looking for. You can reuse your old handles, covers, brackets and tracks as long as they're in good condition.

Well, that depends on how you define bracket in this case. I don't think we're using that word to reference the same part. When I mentioned bracket before, I meant that rectangular piece that attaches to the shorter hinge arm. That doesn't interact with the track in any way, so it wouldn't be jumping out of anything. 

The list of parts I see in your photo, ignoring the two operators I recommended above, are as follows:

• 39-107 cover
• 39-114L handle
• 39-505 or 39-533 track, depending on hole count
• 39-517 bracket, opposite side being 39-516

If none of these parts reference the bracket you refer to, please show me a clearer picture of it.

Are you talking about the white nylon wheel at the end of the operator arm? If so, that's not available separately. If that broke, then you will need an all new operator.