Brodhead Pietenpol Association

Original Posted By: Frank Metcalfe
Subject: Pietenpol-List: Rounded Seat for Delrin Needle, Stromberg Carb, ContinentalA-65After overhauling my Stromberg NA-S3B carb in 2003 and going to the Delrin needle with the counterweight, I now find that I should have replaced the needle seat that has a rounded shoulder where the needle engages, part #383911. Several websites for Fly Babies, Luscombes, etc. referred me to SkyportServices but they don't have any, nor does Fresno Airparts (I thought they had parts for everything from the Wright Flyer on!). Aircraft Spruce, where I bought the needle but which made no mention in the catalogue that a different seat was called for, is researching if one can be found. Meanwhile, I turn to the real experts. Does anyone have a source for the seat that works with the Delrin needle? Does anyone have a seat they're not going to use?Matt PaxtonPiet NX629ML________________________________________________________________________________Date: Thu, 24 Mar 2011 12:53:15 -0700 (PDT)

Original Posted By: owner-pietenpol-list-server(at)matronics.com
No, I've got the stainless steel needle. It leaked like a sieve until Ilapped in the valve seat. I mounted the valve seat in a drill press vice,chucked the needle in the drill press, squirted some Crest toothpaste ontothe seat and used the drill press to spin the needle against the seat,lapping it with the toothpaste as a fine abrasive. It works perfectly andno longer leaks.Could you do something similar to round off the edges of the seat you haveso it would work with the delrin needle?Jack PhillipsNX899JP "Icarus Plummet"Raleigh, NC _____