Casement Operator identification

A quick learner from New Jersey says:

Hello

I have an Operator that is window mount (5" between mounting holes)

It has a short arm (3") and a long arm (5.5") 

The long arm clips to the window - am unsure how to unclip it to take pics of it removed. Appreciate your help!

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Bob from SWISCO responded:

This looks like the 39-187 and 39-188 Split-Arm Operators, but unfortunately these operators have link arms that are 5" in length, not 5-1/2". We don't carry versions of these operators with that link arm length, but you have a few options. First, you could try installing the new operators and seeing if they work anyways. If they don't, you can try re-positioning the stud bracket the link arm connects to and see if that makes up the difference. If all else fails, you can try swapping the old and new link arms. If you're up to the task, drill the link arms out, then use a 62-014 Rivet to connect the old link arm to the new operator. 

A quick learner from New Jersey says:
That is what I thought, but appreciate you confirming, thank you!

Ordered!
A quick learner from New Jersey says:
Yep, the link arm needs to be the exact right length. Moving the stud bracket didn't work.

I've drilled out the old and new rivets and am ready to order the rivet.

Can I use a hammer to press in the rivet or do I need a press?
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Tom from SWISCO responded:

Thank you for confirming that adjusting the bracket doesn't work. I'll make sure to log that away for future reference.

To use the 62-014 rivet, you just need a hammer and a metal plate. You're just looking to have the skinny end of it mushroom out.

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