Help repairing worn screw holes in plastic

[Kelevra]

Guys

I also posted this in the bike specific section, but I think its a general problem. My search didn't turn up anything helpfull.

I clean my filters quite often, this however lead to the wear of the holes in the bottom part of the box where the screws (marked “8”) go into. The seal is not as tight as I want it to be. The top part is actually loose.

Is there any way I can cure this, maybe a product I can put in the holes to create new thread. I really don’t want to replace the whole box.
Thanks
Dave

 

[Piston Pete]

 

[Knormoer]

 

[MCB]

 

[Sharingroads]

 

[hedleyj]

 

[Bundu]

 

[GRIM]

 

[tok-tokkie]

 

[Kneeslider]

 

[Fudmucker]

 

[Kelevra]