A call out for experienced advice! I'm not an airhead guru. I'm getting ready to button up the top end on my '94 GS. When I pulled the jugs off the old girl I noticed the factory used a small amount of sealant on the jugs...no o-ring or gasket. the fiche shows an o-ring, which I bought when I ordered my parts. The Haynes manual, with pics based on older models, shows a base gasket. The barrel is clearly machined to accept a ring, and the mating half in the case appears ready as well. I don't recall Snobum saying anything about this. What do you regular builders say??