I found a really good thread on a chain case mod several months ago and I can't find it now. I believe the gear oil in one of my gear boxes is draining into the chain case. When it does the machine gets noisier. When I add gear oil it quiets down for a little while but only lasts about a day. The mod I am thinking of requires adding a second fill plug at a higher level on the access plate and making it where the gearbox and the chains share the same oil... Anyone know where I can find it? Thanks, Charles