Window crank arm rusted

A handy person from New Jersey, USA says:
I have a small truth window in my shower it's 16 1/4 x 35 1/4. The crank and hardware is rusted shut. I can only find one part number 20810A. Please inform me on what parts I need to replace and I will send pictures.
Thumbnail of the uploaded file named 3FAD5216-45AF-4DA9-B80F-A4E1655ECC58.jpeg
Thumbnail of the uploaded file named DDBC88CE-C526-4708-BC65-F90DC2994FC5.jpeg
Thumbnail of the uploaded file named 4818D66D-4F80-4DD6-97FE-8AB11A36EDEF.jpeg
Thumbnail of the uploaded file named B62731F9-AB7C-48CB-9813-7B21C1BBC659.jpeg
Thumbnail of the uploaded file named 8E6D0881-FB60-4FB8-932D-C169563BA512.jpeg
Profile picture of Emily
Emily from SWISCO responded:

Hi there!

The hardware shown in your photos looks like our 39-171 & 39-172 operators and 39-513 & 39-514 stud brackets. As for the hinge, take a look at our 36-048 . Look over the dimensions for these parts and compare them with yours to see if they match up. Note, you will need to replace the top and bottom hinges at the same time. 

A handy person from New Jersey, USA says:
Hello thanks for your response.. dyad operator 39-171 looks like it might be the one I need but in your picture with the measurements you are showing the arm is 5" mine is measuring 4 1/2" or from hole to hole 4" so not sure if it will work ?
Thumbnail of the uploaded file named 865CFB5D-77E8-4DC8-AD2C-A91C7433F5CC.jpeg
Thumbnail of the uploaded file named CF84BB6B-CDC1-4BE6-B48D-2EB7C6E6B197.jpeg
Profile picture of Emily
Emily from SWISCO responded:

In that case, you have two options. You could move your sash bracket to compensate for the arm difference, or swap the arms altogether. This can be done by drilling out the new and old arms, then installing the old arm on the new operator using our 62-014 rivet. To install this rivet, you'll have to hammer it in; I recommend doing it over a metal plate, if you have one. 

Connecting a casement window operator to stud bracket
Connecting a casement window operator to stud bracket
VIDEO
WATCH >
Anatomy of a casement window
Anatomy of a casement window
VIDEO
WATCH >
How to Replace a 2-Bar Hinge Set on a Casement Window
How to Replace a 2-Bar Hinge Set on a Casement Window
VIDEO
WATCH >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.