I have experienced the same with the new Moss "Sock" filters. They
appear to be a little (1/8") long, but once placed in the filter
housing, and tightened, they are compressed, thus being "held" in place.
At least they now have marked instructions on the filter. The mesh
screen end is to be placed at the top of the cannister. It is to trap
the fabric, keeping any stray media from being pushed into the engine
through the "U" pipe.
That knurled knob on the bottom of the oil pump is an oil pressure
regulator. It was a racing accessory. It allows for increase or decrease
of oil pressure, by applying pressure to the oil by-pass spring & ball.
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