Big update, I was looking at the machine after dark last night using a flashlight & saw a square patch under the dust down in the machine "sump"(?) and what was there? The bobbin plate & a bobbin! That problem solved. Thanks Joe for definite ID, I hate to assume anything. And the belt tips too. Redmadder, that is too funny but what a great reminder tip. I would have never thought to oil the treadle, but I am a blonde, blush
Oh, and I believe I've caught the dreaded treadle fever bad!