The risk comes from futzing with the set screw on top of the ALDA. There's little risk if you change shims between the ALDA and the IP.

What's nice about changing shims is that you can honestly tell a prospective buyer that you've never adjusted the ALDA. See, the seal is still intact >

What gets me about Dave is not how clean his engine is but how clean his hand is with the ALDA out! My hands get dirty popping the hood and that's on one of them corrosion free California cars.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD