Only two of mine were completely stripped, so I used the teflon-tape/epoxy method. (Apparently, the techs who changed the filters weren't in the gorilla class, yet. Although they did crack the cover.) I think I might get a couple more filter changes out of it before I need to use the brass inserts.
(BTW, definite
for McMASTER-CARR. Even if I'm not using the screws and inserts yet, that was test customer service I've had in a long time. My order arrived
the same day. I was afraid it would cost me a fortune for shipping -- they charged me $4.89.)
How to repair plastic worn screw hole
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2008 E91 36K, 6-speed, RWD, Alpine, Terra, Xenons, ZSP, ZCW, ZPP, PDC, CA, alarm, M shifter and M brake handle, Euro rear fog light switch, Euro aspheric mirrors, rear power outlets, Euro split armrest, Lidatek, remote V-1, Cocomats, beach sand, $10 clutch stop mod. 1998 Volvo V70T5 226K, 5-speed, original clutch (third clutch pedal!), aspheric driver's mirror, E-code headlights, IPD sway bar, strut tower brace & skidplate.