Total posts : 45366
I should have mentioned this but missed it in my post. You said you had only one piece of pipe left. Don’t worry. If it is a little short because you have to cut off the bad end you can just make the 1/2 inch piece a little longer. Just keep the total length of the 3/4 and 1/2 the same. If you lose 4 inches on the 3/4 just add 4 inches to the 1/2. This gives you several tries to get it right.
Maybe you should try my tape method on your scrap piece first, and if it works, go for it on your good piece.