I have and elderly CPP2+ with the lift. On the lift, there are two pairs of little white clips that hold the drum up against the gears that rotate the drum on the lift, and on my unit, on one pair, one clip is completely broken off, and the other is cracked, and on it's last legs. I have ordered, and received some new clips, but it is not clear to me how to replace them - does anybody know how you replace those clips?