Hi Bob,
I was under the impression that the hole in the filter nut was designed
to use safety wire to secure the filter from getting loose. This is a
standard practice in aircraft and racing. If the hole can also be used with
an awl to losen it then I guess that is another advantage.
Mike Denman
> I've been using that filter for years now for that very reason. Not only
> does it have that nut on top for a wrench or socket but the nut has a hole
> through it for an awl or screwdriver.....or at least it used to. I haven't
> checked lately. The only downside to them is the cost.
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