351-19 sash weight

A quick learner from CA says:
Hello,

I need 351-19 balancer. sash weight 21.6 lb.
I only see 1850 (18 to 20 lb).

Which one will work? Will 1850 work?

thank you
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Tom from SWISCO responded:

Thanks for posting! The 1850 stamp will likely not work for a 21.6 pound sash, no. It would probably be droopy since it's not quite strong enough.

We can specially make a spring strength that can support your sash weight, though. Before we begin, can you confirm what your original stamp read? Can you also tell me how many you need?

A quick learner from CA says:
Thank you for the update.

The original stamp reads "18 9 IR".
And, I need 2 stamp.

Thank you
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Tom from SWISCO responded:

Thank you again for your patience. I will email you a price quote and order link for a quantity of 2, as requested. We will be using our special 1860 stamp, which can carry 20 through 23 pounds. If you have any questions, let me know right here in this thread.

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