Tight Fit Dimpling Fixture (3/32") EXCLUSIVE by Cleaveland Tool (SKU: DIE4263DF)

Used this last night to dimple the last two holes in an RV flap rib. If you clamp it to a sturdy surface and use a 3x rivet gun to drive the male dimple die into the female tool, it works well. I unfortunately had the same result as another reviewer and the shank on the male dimple die broke where the small compression c-clip sits.

Would be nice if they included or sold a small steel ram with a hole that you could insert your dimple die into and pound on that, vs directly on the die. Guess it's a fairly easy thing to fabricate and will make one tonight.

I have to say I've found this tool invaluable in a couple of hard to deal with locations. In particular places like the last set of holes on the aft end of an aileron rib or every single hole on the u-channel aft spar of a sportsman flap. The only issue I've had is breaking the shank on the dimple die after a long bought of dimpling.

Perhaps this tools will work great for thin ribs or a very narrow gap between the folded halves of skins, but dimpling the rudder ribs for the Glasair Sportsman are stout and no amount of hammering would do the job. I will probably never use it for dimpling ribs. Instead, I finally succeeded using the Avery vice grips with the die welded to the jaws. Simply grind the furthest extent of the die away until it fits comfortably within the radius of the webbing and squeeze away :-)