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Ron,

they are the dog's danglies!

Work with any of my bobbin holders without changing the tension I use on th elarger spools.

Mighty fine guy, that Tupps is!

Sounds as though you might just have too much tension on the arms of the bobbin or you are 'choking' the thread as you tie and causing it to break.
Correct bobbin tension cannot be achieved 'out of...