Casement stop device

A home owner from New South Wales says:
December 6, 2022
My Aluminium Casement window has the following window hardware
1) Interlock 3905 window support
2)Truth winder ( US pat 36149905560082 )

Problem When open a small amount the wind will catch the window and open the window to 90%. In a strong breeze it acts like a sail and ww are fortunate that the window has not blown off
Question. I am wanting to try a windows sash stop device to stop the widow opening. ( would the 39-398 be the product you recommend)
Also what is your part numbers to replace the truth and the interlock hardware
Any other recommendations would be great
Regards Kevin
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Dave Sr. from SWISCO responded:
December 8, 2022

Reading your discussion, I'm thinking it could be that the operator is worn from wind abuse. I would suggest replacing the operator. See if the specifications of the 39-171 and 39-172 match up with your assembly. I also think the 39-398 device is worth considering. This is recommended to be used as a child deterrent, but in your case, it might help with the wind issue. Your exact hinge is no longer available, but if it is in good working order I would not replace it. However, if it does need to be replaced, I recommend the 36-048. Just make sure to replace the top and bottom hinges at the same time. 
Casement Sash Stop Device
Casement Sash Stop Device
39-398
$16.54
Truth Hardware Dyad Operator
Truth Hardware Dyad Operator
39-171
$32.55
Truth Hardware Dyad Operator
Truth Hardware Dyad Operator
39-172
$32.55
2-Bar Hinge Set, 10"
2-Bar Hinge Set, 10"
36-048
$17.47
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