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I agree, but to date, after 5 1/2 years it is still solid. My 4 kids actually sit and jump off those arms all the time, even though I yell at them not to. So far it is still solid. My next couch will definitely have an additional piece set at 90 degrees below that horizontal piece to add support.
It has held up to 4 kids and still going strong. Aside from wear and tear on the fabric, it is been a solid design to date, after 5 1/2 years.
I would definitely like to see how your couch came out.
The springs had a 4" diameter and were about 18" long, uncompressed