Holy cow...I have that exact same Hoppy alignment system (arrow on right in garage fire photo). I just got done cleaning that up a few weeks back.

Also have an earlier unit in the wooden box (arrow on the left).

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DynoDave
Walter P. Chrysler Club - Great Lakes Region
Member # 12304
1970 Plymouth Duster
1972 Dodge Charger Rallye
https://wichargerguy.proboards.com/
1977 Chrysler Cordoba