How to Fix a Sagging Couch/Sofa/Chair for $5

NOTE: Due to Youtube changing the monetization policy to a minimum of 4,000 hrs of watchtime and 1,000 subscribers, small producers like me are no longer eligible. I have about 1,000 hrs of watchtime and 20 subscribers. So, it's doubtful that I will be able to continue posting videos.
How to repair elastic support straps on a sagging Natuzzi-like couch/sofa easily and quickly.
I used (slightly) curved plastic buckles, bought online for $4.70 including delivery, to attach broken ends to each other. Flat buckles are available, but I thought buckles curving upward would work better. (*Visit danvanceart.com/shop as a way to support this and other videos.)
Original video showed first attempt where friction was not enough to hold all strap ends in place - 3 held, 1 did not. Using upholstery thread prevents strap ends from pulling loose from the buckles. This video shows more detail and the more permanent repair.