! Score ! Was it just the head? Interesting foot. Must be for a specialty purpose. Was there any indication of what it was used for? I'm wondering if maybe an early free motion foot.
I think an Expert BT manual may work. One can be found at
http://www.doubleveil.net/zssmp/expertbt.htm at the top of the page. There is another one on another website.
Janey - Neat people never make the exciting discoveries I do.
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