Thanks Dan. I have that exploded view illustration in the rebuild kit I got from Cobranda. Since it covers many early 4150s, it shows a needle, a weight and a check ball. There is no way all three of them fit in at the same time. I have rebuilt many Holleys, but never a 3259. Some have had a check ball, some have had a check ball and weight. due to the size of the needle, i'm quite sure it doesn't also have a barrel weight, but not sure if it had a ball. I think not because the ball would have to go above the needle, but wanted to check with the 3259 experts.