Well I tried. Everything was good until I grabbed the cam, focused and snapped the pic. I am about 1/4" harder at average erection, and the last quarter was 75% on.
Now the bad news in my pics here my dick is only 6" long, not even close to 7". There is even small gaps between the quarters. They are curved somewhat because my dick is to. If I had my wife here to fluff, and I bent the first quarter up some like many did all 7 would fit, and I have an average dick.
The quarters measure about 6.5" long as shown in the first photo. I am 6.25" hard, and 6" in my attempts.
WR