[Hallicrafters] Screw type used to secure SX-28 case cover plate?

[jeff]

Hi,
Could someone please tell me the type (specification) of the screws used to secure the cover plate on the bottom of the SX-28 case? I presume theyre not metric, so am lost, as have no familiarity with imperial types, and will need to buy some.

Ive got an SX-28 with no cover plate, and will have to make one up.
regards from "down-under",
JEFF
Christchurch
New Zealand