Crank Extension for Milgard Tuscany Casement Window

A quick learner from California says:
March 18, 2015
Will 39-357 fit the Milgard Tuscany casement window. I'd like to extend the crank 6-10 inches. Will I be able to attach two 39-357 extensions together along with 39-121 Crank Handle?
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Tom from SWISCO responded:
March 19, 2015
I'm not sure, I'm not familiar with what operators the Milgard Tuscany casement windows use. What is the size of your current spline? The 39-537 and 39-121 both accept a 5/16" spline, so they can work together, I just don't know if they will work for you.
A quick learner from Pleasanton says:
March 19, 2015
What's the proper way to measure a spline? I can just take a caliper and measure from tooth to tooth. I'll try to do that tonight.

BTW. How do the extensions lock onto the handle? Would I be able to lock the extension to the casement window spline as is done with the current handle (set screw)?
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Tom from SWISCO responded:
March 20, 2015
Yes, try that. Also measure the diameter of the hole in the handle. If you want, you can take a couple pictures of your existing operator and we can suggest something from that.

The extensions lock in the same was as handles. You place it over the spline and then tighten it with the set screw. The handle then attaches to the extension in the same way.
A quick learner from Pleasanton says:
March 25, 2015
It measures 5/16" from spline tooth to spline tooth. The narrow dimension (without spline) is 1/4". Attached is a picture of the operator with handle removed.
User submitted photo of their window operator.
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Dave Sr. from SWISCO responded:
March 25, 2015
Looking at your photo, it appears that you have the 39-375 Truth folding handle, which uses the 11/32" spline. For extensions, you would need to use the 39-157 which is 4" long or the 39-337 which is 2" long. Take a look and see what you think.
A quick learner says:
April 24, 2015
Hellp Quick Learner,

Did it worked for you ?

I have exactly the same window.

My other question is : One side ( female side ) of this extension does not have any splines. So how will that attach to the window side of things ?
Crank Handle, 3-1/8"
Crank Handle, 3-1/8"
39-121
$5.39
Encore Truth Folding Handle with Cover
Encore Truth Folding Handle with Cover
39-375
$11.97
4" Crank Extension, 11/32"
4" Crank Extension, 11/32"
39-157
$25.59
2" Crank Handle Extension, 11/32"
2" Crank Handle Extension, 11/32"
39-337
$25.25
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