Mysterious 4k part

[pmarcuccijr]

Can someone help me identify this adjuster (?) on the top of my 4k trans? I recently purchased and installed it, but can't figure out what this does.

Im referring to the off white plastic piece in the foreground.

Thanks.

[fwdvw]

everything you need to know about it from our good friend at BrokeVW

http://brokevw.com/5detent.html