Added the oil line last week while installing the Barnett spring conversion.
First, I would call it well worth the time (about a hour), the cost (about $15).
No, it didnt eliminate the noise completely, but it sure helped. More so at highway speed.
After opening the case i seen there was a nice compartment right over the driven clutch gear. Thats when the idea to pump the oil to the void and meter it down from there to direct oil to the gear.
A few pointers:
I used push to connect air line fittings that swivel. 1/8NPT to 5/32 airline 90s
Makes install easy, takes up little room,
I used a 1/4 NPT to 1/8 NPT bushing in the oil acess plug to allow tightening to reinstall after drilling and tapping.
I used .045 drill bit for orfice.
If i have it apart again i would drill the hole larger.
Other info: The clutch basket turns counterclockwise, that being said you adding oil after the contact has been made. Oiling from the other side should be a better angle but much harder to do!
In closing, after 300 miles today the FB6 is gone from my head!
Your results may vary..