push rod seal

Well, time to do the pushrod tube seals again. It's been 11 years. I searched the forum and was overwhelmed with all the link choices on this topic. Please post your favorite link. Last time I did this was to pull the heads to send to Ted Porter for valve recession. I used Oak's Top End manual.

I know this has probably been covered here many times but I am new here so Please bear with me. I have a 1978 R100/7 that I am in the process of resealing the cylinders and replacing the pushrod tubes. I am replacing the pushrod tubes because they leak badly from both the seals and the joint...