Chuck,
I think you've got in nailed. I managed to bump one of the keels on mine before the solder froze and really need to do them again. Since I haven't made any other progress on the gun, I think it'll be a while........
Where did you get your rosin flux? That was the item that took the most time for me to find. I ended up with a gallon of the stuff (it was cheap) which is probably enought to do 500 guns. I had it stored in the garage and I think it froze because it has become 'clumpy' in the jug.
