Great product idea, I only find something like this on the market. However, this will not work with a 2x4 door frame and a 2X fabric door. The shaft length is a bit short. The thickest product you can make is 4-5/8", not 5-1/2" as they claim. The overall length of the shaft is 5-1/2 inches and this does not include the connection required for the set screw and attachment to the lock. Just make the shaft an inch or two longer. And the end user can cut it to any length they want, or even better, make it easy to change the shaft on either end and have multiple lengths of square shafts available.
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