skylight casement adapter

A handy person from CA says:
April 1, 2018

I can't see any brand anywhere on the thing, but it has a place for a splined attachment to be connected. I would like to purchase an eyelet adapter, but I'm not sure of the size of the spline part. It looks to me like there might be more than one standard size for these things, 11/32 and something else. (Truth and others?)

Please advise how to measure the splined piece so I can make sure I order the correct adapter.

Thank you,
DC

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Dave Sr. from SWISCO responded:
April 3, 2018

Yes, operator splines come in a variety of sizes. The only way to know what you need is to measure yours as carefully as you can.
Universal Joint With Pole Ring, 11/32"
Universal Joint With Pole Ring, 11/32"
39-336
$45.45
Skylight Operator, Angle Drive
Skylight Operator, Angle Drive
39-379
$81.30
Eyelet Adapter
Eyelet Adapter
39-247
$18.72
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