Grease is needed in any part where metal touch metal, or more specifically, where metal touch rubber. If an o-ring is going to run trough this part, then it needs grease. So yes, grease used to be a good idea before the detents, but NOT after. Just a thin film of grease, you don't want to flood it!
EDIT: This is from a general perspective, not marker specific. Looking at the PDF looks like they state to put a small amount of grease inside the groove just after the detents.
Does the bolt goes that far?
Have the bolt an oring on the tip?
Last edited by Ballantin : 08-11-2014 at 06:18 AM.