Scott... I don't use anything to hold the cowl on where it slides under the top of the fuselage forward lip...and I don't have a ACS catalog handy but I'm sure you can look them up...There 1/4 inch in diameter. Best... Steve _________________________________________________________________ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail