Marcussen said:I got the 3905161S FLEETGUARD AIR FILTER MINDER GAUGE, after removing the cap on my filter housing I discovered that there is a screen/filter pressed into the opening behind the cap and the fleetguard screwed right on with no drilling or tapping, I then checked to make sure it workes by blocking the air intake, I was surprised how much blocking it took before it moved.
For a small engine it has a large filter plus I added the optional inner filter.
BX2230_Lockport said:I mean where you screwed it into the air filter cap.