The handle mount strap design is all finished. I have an original "vintage" handle mount strap just to see how cheap they were made. I wouldn't trust the strength of any of the original/vintage straps of the period, even the JVC ones from back in the day are very weak compared to what I make.
When you are talking about boomboxes getting to values in the $thousands$, the last thing you want is a junky strap to fail and your boombox hits the ground
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Check out the final pictures and how the quality of mine is clear. I wouldn't sell these if they were junk.
This is the design available right now. I might tweek the setup with different hardware, but overall you get the idea.
Prices are listed on the first post in this thread
. The best part about this style of strap is that you can use it on ANY boombox that has a handle or a boombox that has 2 bars on the top. Truely a universal strap. Mount it on your Sanyo mini or on your Conion C100, the options are endless.