[JRTJH]

I'd say, "GO FOR IT"... If you're going to need to buy a replacement, then might as well take the old one apart to see if you can fix it before spending the money. All you've got to lose is an hour or so of your time.

O-rings in most items are standard pack items, so if you've got the Harbor Freight O-ring kit, you probably already have the replacement O-rings. Only a Saturday morning and a little "workshop time" till tell you whether you get to save the bucks or spend them.... Good Luck !!!