I don't know if this belongs here or not but I just got one of the Heads-up straps that I read about here. I was skeptical but thought I'd try it anyway.
I've got a Thunderbird and Epi Viola and it balances both of these basses perfectly! I'm really happy. It took only 1 of the weights for the Viola and all 3 for the Thunderbird.
I played the 'bird for about 40 min and really didn't notice much as far as the extra weight.
I'm really happy with it! No affiliation with the manufacturer. Just a product review
