[uwanna]

Have been adjusting 911 valves since 1970. I always of course used a feeler gauge. A year ago I bought a Kirk tool and have retired my many somewhat bent and wrinkled .004" feeler gauges.
The Kirk tool to me is a well engineered precision tool and uses a long proven
and accepted principle. i.e. the pitch of a threaded rod can be used to determine
how far the rod moves with a given rotation. This is the very principle that is used
in a precision micrometer. It also is used in adjusting, with precision, the moving tool mount on a metal lathe. We all trust and believe in these precision tools, why not trust the Kirk tool to be MORE precise than a feeler gauge followed up by a subjective "slight drag".
The beauty of the Kirk is the adjustment markings on the tool are in essence the same thing as the measurement markings on a micrometer. I am a convert as the tool is much faster and less "fiddly" to use and more precise as well as being beautifully designed and crafted!
just my $.02 YMMV
Grant