Torsion Springs: American vs. Foreign
Saturday, December 9th, 2023 at 1:31 pm by Dan Musick![](https://ddmgaragedoors.com/blog/uploads/2023/12/DDM-Spring-Tester.jpg)
At DDM, we run at least three tests to ensure the quality of our springs.
One of the tests is cycle life. We’ve found that some of the imports are lasting 30-50% longer. …
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