Using the pump yesterday it felt like it was full of treacle so I took it apart as much as I could, cleaned the barrel and plunger and then applied a WD40 equivalent and it's much, much better now.
Is that ok for a long term fix for the stickiness or is there a more suitable lubricant I should use for that?
Also, the handle still sticks - is there a way of taking it apart for cleaning as WD40 and airline in combination haven't done the trick?