Timing slips on the 009 distributor

[Steve]

Hey Guys,
This Vw Type 1 distributor timing change is old news, it's on the net and I've posted about it more than once... If you don't believe what I've posted, here's another post than says you should witness mark the dist. timing setting and check it once in a while - like maybe before you flip a prop on that engine:
http://www.thesamba.com/vw/forum/viewtopic.php?t=537055

Witness marking-
http://www.chiefaircraft.com/torque-seal-b.html
The Orange fades in the sun - use Blue
Steve

[Dan_]

This feller has a way to stop the timing slip...  He calls it a "grub screw".

Scroll about half way down the page.

http://www.reocities.com/scottjjohnson2000/enginelog/logindex.html

There is a lot on Scott's page but the "grub" is shown below as well...