Window Cranks

This operator resembles our 39-172; however, the 39-172 has a 5" link arm, whereas yours is 4". This comes up fairly frequently. There's a good chance that the 39-172 will work for your window as is. If it doesn't however, one option would be to reposition the bracket that the operator attaches to compensate for the difference in size. This would require drilling new holes to re-mount the bracket. Let me know what you think.