My small window operator unfortunately has broken. It's small with only one arm attached to the railing
Casey from SWISCO responded:
May 8, 2023
Hello,
The casement operator shown in your photos resembles the 39-216 and 39-217. Take a look and review the specifications below to confirm that they match up to yours. These parts are compatible with the 39-107 cover and 39-114L handle. Thanks for posting!