For those of you using the O.S. 160FT that do not want a large hole in your cowl for the needle valve (I hate holes in my cowl) here's how I did mine. Some of you may already have done this but having the cowl curve under and measuring correctly can be a bear! Put the cowl on using the cowl screws and then place a piece of tape vertically onto the fuselage at the end of the cowl.
Remove the cowl and measure from the tape to the center of your needle valve. Now place the fuselage on a hard surface...not a rug...and measure up to the center of the needle valve. Put the cowl back on again with the screws and using the first measurement you got from the tape measure out again from the edge of the cowl and mark with a pen. Now using scrap balsa or a small dowel (I used a 1/16" dowel) cut the dowel/balsa to the length you got from the hard surface and hold it up to the cowl and mark again with a pen at the top of the dowel. Double check and drill a small hole and it should be right on. Sorry i've been away from the thread lately but between work and waiting for parts to finish my cub i've been a little busy.

Bud