Good news!

...and bad news.
The good news is that I didn't a 1-1/4 inch pipe ... the OD of a 1 Inch black iron pipe is 1-1/4 inch! Which is the exact same size of my tuyere opening. So I was able to buy 2 twelve inch pieces and a tee.
The bad news is that the weather isn't cooperating for me to mix and ram my refractory. (Good ole Coastal North Carolina. If you don't like the weather, wait 10 minutes and it'll change)
Do I also need to cut a hole in the inside form for the tuyere, or do I just insert the pipe and press it up against the form and start ramming the refractory?