Nice. I did the same thing about 12 years ago to a 1958 Cub that's my Grandfather bought new. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-2_009lV7BdQ.html
I installed a new pump my adjusting nut on the valve is also turned way in. like urs at 41:50. My arms went all the way up. SO did you just move the nut almost all the way back out to the end of the threads and it worked?