I can't flick most Seki lock backs without completely shredding my nails. Besides, it requires so much concentration and weird hand contortions that it just isn't worth the time or effort in the end.
On the other hand, I can flick most liner locks without issue, both in regular and reverse grip. I usually won't flick the ones with the over-sized opening holes, however, as my fingers tend to get stuck in them.
The problem of a coherent civilization is the problem of living with ignorance and not being frustrated by it.
Try the Yo2.
The thing just flies open with middle finger.. and it feels natural once you do it a couple of times.
This is a great lead in to my response. I could never flick my Spydies with middle finger and was amazed by the videos. Then, got a Yo-2 one day and it worked just fine. Suddenly found that it worked with all others. I'm thinking the YoJimbo is a good starting point/trainer for this technique, at least for me.
I think this video is good. For smaller hands, technique and the right knife is important. Pm2, para3. Any compression lock should do. My lil temp is the best for me. Don’t just flick perpendicular to the scale. The flick is more up in the direction that the blade will be pointing. Adjust hands to give as much follow through as possible. Just my 0.02
I learned the thumb and middle finger flick on a Persistence. It took a little practice at first but now it's second nature for me. I never try to flick my back locks. It doesn't work very well for me and I think it's hard on the locks.
The key for me is how I hold the knife. I use my thumb to press the butt of the handle into my palm. The index finger is near the pivot providing support. Like SF Native said, follow through is important.
Of all the things I've lost I miss my mind the most!