Dave Sr. from SWISCO responded:
May 25, 2017
I took some measurements of one of our 40-079 and it seems to be coming up a little short, possibly closer to 17-1/2". However this is the recommended closer to replace the old Storm King 105. I don't believe there is any other closer available today. One more thought, try lubricating your old closer. These Storm Kings seem to last forever and that may be all you need to give it a new lease on life.
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