Need replacement for old spline

A quick learner from Lake Orion, MI says:
October 25, 2018
This ancient storm window is 3/8" thick outside width. The spline is so old & stiff I won't be able to reuse it. Which part would you recommend to replace the spline? Thanks!
Profile picture of Tom
Tom from SWISCO responded:
October 26, 2018

Can you remove a piece of spline to show us a different angle? We need to see a "profile" like in this drawing:

Example illustration of a cross section.
Example illustration of a cross section.
A quick learner from Lake Orion, MI says:
October 27, 2018
Thanks for your reply! To my surprise, I was able to remove the old spline without destroying it by heating it with a heat gun. Here's a pretty good view of the end & bottom.
Profile picture of Paul
Paul from SWISCO responded:
November 2, 2018

Thanks for the photo. I see that you have a very small and thin drop in glass spline. Our 59-068 spline is very pliable and may fit into your frame. The locking kerf measures 1/8" and the length is 3/16". 
Universal Glazing Spline, 25'
Universal Glazing Spline, 25'
59-068
$15.95
How to Re-screen an Andersen Window Screen [1080p]
How to Re-screen an Andersen Window Screen [1080p]
VIDEO
WATCH >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.