The 1/4" spacer plate was necessary to fit the available replacement thermostat after the original Holly three spring stat was no longer available. Recently Moyer Marine has developed their own thermostat that is an improvement over the original Holly and does not require the spacer. The fancy fasteners accommodate the spacer without replacing the studs.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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