Jeff...I too have just received a new unit the same applies to mine in reference to the circular threading...However I noticed that the density isn't even close to what my other 65% units are. The density of course on the sides and back are ok...but the top is really thin...I didn't notice just how thin it was until I had it cut in...Now it it really noticeable...It looks like I am really starting to lose my hair. Also the tape is not sticking at all to the unit..I have been using ST30 all along but this unit it just won't stick...I even washed it a couple of times before I had it cut in. I know I will not be able to wear this one. Cheers