Originally Posted By crackedback
Check the size of the upper stud nut

Small is about 5/8

Large is 13/16

IIRC


Thread diameter of small ball joint UCA's are 7/16 inch.
Thread diameter of large ball joint UCA's are 9/16 inch.

Wrench size nut for large ball joint is 7/8 inch.

That's a very easy way to determine, large, or small, ball joint UCA's while installed in the arm.

Last edited by hemi71x; 02/15/16 05:12 PM.
RF-4C Phantom 69-370 Zweibrucken, Germany