There were two different sized ball studs used on Hot Spring cover lifters One is this 1/4" threaded shaft and the other (3rd qtr 2009) is 5/16" threaded shaft (part 75149) Either one size or the other will be on your cover lifter but not both sizes Ball ...read more

This ball stud is found on 3rd quarter 2009 and newer UpRite, Cover Cradle and Cover Cradle II lifters The older cover lifters used a 1/4" threaded shaft ball stud which is part# 71107-BYP