Whenever Ive had this problem in the past, I do spray it with a little penetrating oil, then with the c clip pliers engaged in the openings, squeeze together and hold while sliding a small pick underneath any part you can. It might wind up going flying off, so be careful.
The O rings were leaking past, so there is plenty of oil on the C Clip.
I just played around with the assortment of bits and I realized it is the angle of the bit used to keep the angle correct throughout the movement when applying pressure to the pliers.
I'm trying the bit which is 45 degree angle and does not have the baby tips. Hope this works.
