Hi Tiger, looks like good old 3/16th whit to me. There is a brass insert in there. If you get stuck I have a truckload of the inner filter covers here

Entire Thread
Subject	Posted By	Posted
Air filter cover screw not engaging	tiger	08/11/17 08:02 AM
Re: Air filter cover screw not engaging	NormK	08/11/17 08:38 AM
Re: Air filter cover screw not engaging	tiger	08/11/17 10:50 AM
Re: Air filter cover screw not engaging	NormK	08/11/17 09:15 PM
Re: Air filter cover screw not engaging	tiger	09/11/17 01:06 AM
Re: Air filter cover screw not engaging	NormK	09/11/17 02:22 AM
Re: Air filter cover screw not engaging	tiger	09/11/17 04:17 AM
Re: Air filter cover screw not engaging	NormK	09/11/17 06:21 AM

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