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MK Control Horn Installation

Step 11

The only gripe I have about the MK horns is that the bolts provided are NOT of any use for any pattern plane I've seen - they simply are not long enough to go through the surface. So order up some 3mm x 30mm bolts and custom cut them for the length of the surface you are building.

You want as much thread as possible going into the horn portion of the horn without bottoming out.

Order a few 3mm nuts too, and put a nut on the bolt before you cut it - this way after you cut and file the bolt you'll make some "sorta threads" when you remove the nut, allowing the bolt to start into the horn without cross-threading.

Photo 11 (above) shows the final installation from both sides, before beveling the leading edges. After the plane is painted, the horns will be re-installed using some Loctite, and that will most likely be the last maintenance they ever need.

If you are not glassing and painting, then before covering use THIN foam-safe CA to seal the balsa, letting it penetrate into the ends of the block (top and bottom) thoroughly.

If you glass and paint, just give a good coat of thinned epoxy finishing resin to those ends and it will soak in and harden the block nicely.

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