Well...no need for redundancy, so I won't repeat the technique, although I would like to mention that the "Spydie Drop, New York Drop, Biker Drop..note the word DROP) is best suited to tip down carry knives, as opposed to tip up, like I tend to recall most Spydie Enduras and Delicas to be.
If yer interested in the speedier openings with that one there's a few other options open that may be worth investigating.
#1 dig out the dremel tool and cut yerself a wave style latch into the opening (ya' might wanna perform a search for specific methods) (most folks cut into the hole, although I tend to recall "Satin" made one without doing that by cutting a "V" right about parallel to the hole in order to preserve it)
Bad part is that it is permanent, easy to screw up making, and easy to screw up your clothes with. Oh yeah, and if aesthetics mean anything to you, it tends to make yer knife pretty ugly.
Another thought is to do what my wife did with her Delica and put about three or four small zip ties through the top of the opening hole. It has a very "wave like" effect, and is very darn quick. Best part is that it's non-permanent, and if it looks like hell you can clip them back off. I've been carrying my Axis AFCK and my large Ascent this way for about a year or so, and love it. I actually find it better than the wave in that I can draw straight up and open the knives, and don't need to make a rearward motion to make the hook catch.
Lastly is the "Brownie Pop" or the other slightly modified variations of it that most of us have been playing around with for years. I'm not even remotely close to giving up my Emersons and other "wave-able" knives, for it, but...it is reasonably quick...quicker than most _______drop openings, and much more secure for the sake of knife retention.
Bear in mind, it's all pretty much a matter of individual preference. have fun, eh?