Hi, My first summer job during High School was building toys for Normatt. All this took place in 1972-73 in St. Paul, Minnesota. Normatt hired 16, 17 year old kids to work their 40 foot assembly line. We assembled scale model, battery operated snowmobiles as well as a Winnebago RV. One of the new products that Normatt came up with was the BI-SHACKLE. The BI-SHACKLE was a bicycle lock. The product was designed as a lock that could not be cut using a bolt cutter. You would clamp the thing around a tire and use a conventional rubber-coated cable to loop around a tree.
Even as a 16 year old I looked at this thing and recognized that even if a thief couldn't cut the shackle, they could easily cut the cable.
I don't think the boss appreciated my input.
I'm looking to buy one of these things. Contact me if you can help.
Cheers, Tom