Thank you "abc_1223" - I did taped the towel at the ends and it is close to 2.5" OD. Works great for now. However, I do like your idea about adding piece of real rope. Since I have built my own pull up bar in the backyard, it is really a toll one, so I think I could make even better use of it by adding short piece of rope. Granted it is not going to be near close to the "real thing" but it is better than nothing...
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