1975 300D Adjust idle just a bit.

I would like to adjust my base idle up just a bit on my 1975 300D what's the best way to adjust?

Also, when I adjust the idle from the inside using the dash adjust knob, it seems to have an affect on the linkage making the trottle pedal a tad harder to depress, and it's not as smooth.

Any ideas or info would be appreciated, thanks.

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