screw in ball joint

ok so i ordered these ball joints for my belltech spindles so i could make lower arms......



well the castle nut wont thread onto the shaft when i insert the ball joint into the spindle... and if it did it wouldnt tightn down far enough for the cotter pin to go in.....i was informed that these were the correct ball joints...is there somethin i am missin?

Might need to ream out the spindle alittle. I had to on my screw-in uppers.

Get a taper tool and taper the spindle further, the tool looks like a cone shaped bit you use with a drill.

question answered....its a moog K778 for a chrysler...just have to use a spacer between the spindle and the castle nut to space the castle nut even with the cotter pin hole or just drill a new hole for the cotter pin...same ball joints steve @ can do uses and he sells his with a spacer from what i have been told

Wonder what the difference is from the K727.