Need a heavy duty receptacle

Apology accepted.

Mark - I feel your pain. I've had my own struggles with heavy power cords that don't want to stay plugged in. I've used 4 different fancy outlets. IME...

-PS Audio: Death Grip
-Shunyata: Loose Grip
-Maestro: Moderate Grip
-Synergistic Research: Death Grip

Of these outlets, the Maestro sounded the best in my system, in spite of the fact that it doesn't have the strongest grip. So I resorted to extreme measures, which you can see here and here.

I removed the outlet cover and used heavy duty zip ties (white) to secure the Nema (male) ends of the power cords to each of the outlet receptacles. The circumferences were the same, so I got lucky there. Then I used an L bracket with light duty zip ties (black) to provide more cable relief.

I don't even want to know how many codes I'm violating.

Bryon

I know I'm not the only audiofool around who uses some kind of device to suspend cables off the floor, and I'm surprised no one has mentioned them. My cable lifters are plastic-conduit couplers. The smaller ones are c. 2-9/16" high by 2-5/8" diameter; the larger ones are 3-1/2" h. by 3-1/4" d. Seems to me they were just under $1 and less than $2 at Lowe's. Painted them sand color.

http://i89.photobucket.com/albums/k220/jeffreybehr/Room/12Sep2012_frontfloorcable_1200h.jpg

My powercables NEVER creep out of my duplex outlets.
.

I too use tie wraps to support cables but I use them on everything. RCA, XLR, AC cables and anything else that might cause stress on the device it's plugged into.

Supporting or suspending the cable is especially important if the
component is mounted on certain types of vibration isolation devices as the
cable shouldn't be allowed to exert a force in any direction as that would
interfere with the balance and proper operation of the Isolating device. In
some cases, suspending the cable from the ceiling is a viable method and
kills two birds with one stone.