I had to use the sand paper deal in the past too...it does work...just a bit tricky to get everything in there to stay well enough to put into action...but that was on a vertical mount filter.
The screwdriver situation can turn ugly fast...worked better back in a day when material on the outer casing was a bit heavier/thicker and you had bit more room.
that is what is appealing with the K&N filters, they have a nut on the end of the filter....not sure how they rate for filtration though
Last edited by enriched; 02-01-2012 at 07:59 AM.
Reason: more info