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Scott, I think the best answer is to simply tap those bolt holes for the thread size of your bolts. This does a number of things. 1. There is nothing to fall off inside the plenum, no nuts, no bolts or no nut plates 2. Its a few fractions of an ounce lighter 3. You never have to worry about getting onto the back side of the plate (looks like you intend to weld it to the plenum tube. 4. Two of your nuts are pretty close to the wall of your plenum if that bright circle is indeed where it will be placed - can't tell for sure but could be interference with the wall of plenum. 5. You never have to worry about it again. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.dmack.net/mazda/index.html ----- Original Message ----- From: "Scott" <squiggles@yahoo.com> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net> Sent: Tuesday, August 21, 2007 2:59 PM Subject: [FlyRotary] Throttle Body Nut Ideas Hello All... I was hoping for some ideas on how to mitigate or eliminate the risk of a nut falling off the mount plate of the throttle body. As you can see in the attached picture #1, two bolts are just inside the intake manifold. Thoughts that have gone through my mind: 1) Tap the holes, then use a larger bolt with locktite( or similar ) 2) Use a 1/2" aluminum plate to attach the throttle body to, countersinking the back side deep enough to allow the nuts to sit recessed, then attach that assembly to the plate you see in the picture, however using holes drilled outboard of both the throttle body and plenum I really don't feel that leaving the nuts inside the plenum is wise, but perhaps I am worrying too much... What are your thoughts? Thank You -Scott http://www.zenithair.com/bldrlist/pm.cgi?login=squiggles&action=display&private=& ____________________________________________________________________________________ Yahoo! oneSearch: Finally, mobile search that gives answers, not web links. http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC -------------------------------------------------------------------------------- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html