It's got about 1" of up and down play, and is frictionless - just sits in the down position. When I want to set it, I just need to lightly press it to the top - hardly any pressure needed when it reaches there, and that sets it.

It feels quite different to any other cruise control I've used, but I haven't had the chance to try another R129 for copmparison.

Should it be like this?

Ken Silver
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~1993 SL500, glistening blue-black on black leather, xenons, no headlight wipers (from choice).
~1991 Daimler, shiny grey on grey leather, best in country!
~1991 Miata MX5, sparkling BRG on tan leather, wife's (but my polishing)
~1992 Honda US s/wagon, black/grey
ex 350SL, 230E, 280E (and a lot of other makes not nearly as nice)