Nancy,
I'm sorry to hear about your 319W. I kinda understand about timing sewing machines.
It's too late now, but here is something I learned from working on cars and trucks. When you have to take something apart that has critical timing, put witness marks on everything. A small mark on opposing pieces will help you get it back together the same way it came apart. Works on distributors, should work on bobbin hooks.
One more thing; when I was first married my wife had her two boys from the first marriage. To prevent unwanted trouble I put a lock on our bedroom door. Kept them out of trouble more times than not. When grand son comes to visit, lock the sewing room door.
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PrincessPolkadot,
Welcome to the forum.
That's a nice machine. Some cleaning and TLC and I'll be she purrs like a kitten. I can't help with the needles though.
Joe