i had an old spark arrester screen laying around so i flattened it. took the end cap off the woods pipe and stuck the screen on and then put the cap back on. looks like its approved[img]i/expressions/face-icon-small-happy.gif[/img] i hope i get by with it. i did notice i lost a little power with the screen in. any one else see the same thing? im going to halsey national forest in nebraska. man made forest it pretty cool.

 

RWR sells an end cap that accepts disks too.
just FYI but some places are wise to some of the homemade arrestors - some places actually look at mesh count, and even inspect clearance between disks on disks systems - common thing people do is shim disks with washers for more flow but I know people who have been busted for this stuff and made to correct it. lucky no tickets!
but you used real arrestor screen so it should pass just fine!