You can see the drive band (thin red tube) going over a big oreo-style pulley on the back of the bobbin. This pulley was extremely heavy – not recommended. Later we made smaller, more lightweight pulleys. This allows for much smoother action when you put the bobbin onto a lazy kate.
The red tube is a stretchy grippy drive band, which we bought from a local company called Susan’s Spinning Bunny. It’s adjustable, so you don’t need to know your wheel’s size before you buy it. However, when we first built the wheel we used a piece of 1/4" elastic from a sewing store. That worked too.
The container hanging off the back is a "survival kit" with spare drive bands, etc. It hangs on a special bracket. You can get one of these containers, with bracket, for about $3 at a hardware store. I just screwed the bracket right into the back post.
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