Casement operator

A home owner from Michigan says:
Hi,

Can't find brand of windows anywhere! The latch midway up side of window has HTi on it, the casement operators only have LS and RS on them but the handle to crank does have what looks like two M's on top of each other.

The part that mounts to the sill is about 4 1/8" from screw to screw. The small arm to crank is about 3.5" and the longer arm that attaches to window is about 6"
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Tom from SWISCO responded:

I recognize this operator. This is a very old Roto brand part that was discontinued. A newer model was in production for many years, but then that, too, was discontinued. At this time there is no known working substitute.

Not all hope is lost, though. We have a theory that our 39-221 and 39-220 operators can work as a substitute. Unfortunately, we don't have these older Roto windows to try them out on. I'm afraid there is no confirmation as of my writing this post. I can tell you that nothing else in our inventory will get closer than these. While we cannot guarantee that they'll work, we can also guarantee that you won't find anything better.

If you want to try them out, you'll also need new 39-205 handles, some 39-508 stud brackets, and some 39-105 detach clips. We'd be very interested to know if these parts work out, but we understand if you didn't want to take the risk.

I'm sorry we can't offer anything else at this time. 

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