Love em,
You have two options, firstly you need to remove the 2 pins and take apart for the correct lubrication to be carried out, once apart I use silicone grease, smear it over the 2 o rings then reassemble it will be like new.
If you find in general the aquatap is a little tight for your liking remove one of the o rings this gives less resistance to the twist action, you find that this is too sensitive when in operation.
The whole operation takes less than five minutes
Darran