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At Probuild we have found that the most reliable way of fixing an underbelly to the fuz is by a very simple system that if installed correctly will not come loose due to vibration.
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The underbelly is fixed to the fuz by 5 cap head bolts, one in the nose, 2 over the wing and 2 at the end of the underbelly.
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The method used is very simple, using two sizes 1/4" OD and 3/16" OD of Polystyrene plastic tube one slid inside the other to hold a 4-40 x 1/2" bolt in place (See Sketch)
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The bolt positions are marked out on the underbelly flange, and then drilled out to suit the dia of the 4-40 bolts. The bottom of the underbelly is also marked out and drilled out to 3/16" to enable the plastic tube pass through the bottom of the underbelly
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The underbelly is offered up to the fuz in its correct position and is then marked out through the holes you have just drilled in the underbelly.
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The fixings in the fuz are dubro threaded inserts or captive nuts mounted on a light ply backing plate (See Sketch) are glued in position inline with the holes on the inside the fuz.
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The plastic bolt assemblies can now be glued in position using cyano and epoxy.
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When set, the plastic tubes are trimmed to just proud of the surface then sanded to the underbelly profile with wet & dry.
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That is all there is to it, a very reliable and simple method fixing.
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