Where did you buy your hook bolts from ? I get mine from the local Home Depot but those will start bending at around 400 pounds.I made one similar to this by Boo's instructions. I used a scale to see how tight the string will stretch, mine will stretch to 500 pounds if needed. I marked the bolt to show when I'm tightened into the 300 pound range.
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I've got my system hooked up pretty good now Boo, thanks. I could've used that when I first started a couple years ago when I was using the BCY Micro string stretcher and I was bending hook bolts on a weekly basis. Since I've upgraded, I don't have this problem anymore. I can see how by straightening that bolt out would disperse the load better.Marty, take your hook and beat the first bend until it is straight as in the letter J as opposed to them being in the shape of a question mark.
My design does not allow for constant tension due to the lack of flex in a 2X4. To alleviate this, install a washer, then a die spring, then a washer. Instead of a nut, use a threaded rod joiner which is essentially a super long nut. Also use MoS2 on the threads. It is far better than oil, grease or any kind of anti seize.
20mm OD 20mm Long Heavy Load... 20mm OD 20mm Long Heavy Load Compression Mold Die Spring Green 10pcs, Leaf Springs - Amazon Canada