tried to grease my whirlaway for the first time in over a year, what a job, managed to get the grease gun over the grease nipple, but only got a bit in when the grease gun locked, then i tried to get the grease gun off the nipple and it was locked on?? dont no if it was pressure keeping it on or what?? i had to unscrew the grease gun with the nipple attached and a spring popped out the back of the nipple. weird? it must be the spring from inside the nipple. dont know how that popped out, anyway what shall i do? will it be ok to just buy a new nipple and just screw it back on or what? i need to get more grease in the drum as the spray bar seems clogged up as its not turning freely!

i usually love "nipples" but not this type!

any help would be great guys.