Micheals Flushmount Cup (one only) - as used by McMillan. QD Swivels sold Separately

The flush cups measure (O.D.) about .557" to .558". Use a 9/16" end mill or drill (.562") and drill a hole about 1/4" deep. This will let the flush cup slide in about 1/2 deep so that it will not chip the gelcoat if you try to screw it in. Then use a 17/32 drill bit and go another 3/8" deeper. This will let the threads "bite" about .015" on both sides. Then swab the inside of the hole with glue of choice, degrease the outside of the flush cup, and start the flush cup into the hole. Use a 1/4" hex wrench to screw in down into the hole until it is flush with the stock. Making the 17/42 hole about 1/8" extra deep leaves room for the glue to puddle up without oozing up into the cup. Using the threads to control the depth lets you put it right where it has to be for the swivel loop to function.
 

Availability: In stock, usually ships within 1 to 3 days.