anyone that wants to practice brazing should get some 4130 1 1/8" .038 wall, and some 1 1/4" .058 wall**. Cut the 1 1/4" up into short pieces and put one of them on a length of 1 1/8" and braze them together. Do that until you can get the braze to flow out the other side without any drama. No need to buy bike parts for that.

**sizes are for illustration, buy the next larger size in .058 wall and it has the perfect gap for brazing.