Hello Chuck.
The three screws you will need to mount the Variometer are BSF, Steel, Countersunk, Slotted 1/4-26 x 7/8 inch. You might have to purchase slightly longer and trim them. They CANNOT exceed 7/8 inch in use. If they extend too far into the variometer case, you risk serious damage to the coil assembly inside the variometer when it rotates.
There is a company in the burbs of Boston sells them, by the way.
David
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