My recently acquired ‘72-MB-220/8 has a Stromberg "175CD" carburetor on it. Can someone please tell me how to adjust the mixture on this unit. The aluminum tag on the top of the unit has the numbers " 000-070-7604" stamped on it. There is a small ramped boss on the top of the water jacket housing with the word "RICH" and an arrow pointing to the right. There is also a small slot behind the boss with a spring loaded lever just below the surface of the housing. QUESTION: How do I adjust this mixture control ?

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Thank you for your time and courtesy.