here you go
The key for me was to use about 3/4 of a full track so whatever hair I bought at the beauty supply I would cut off the last 1/4 of the track and fold the track to the same width as the mane clip. My clip held the tracks securely and there are some plastic teeth along each edge of the clip. I made sure to gently press the teeth on the top edge of the clip into the top of my ponytail (almost to my scalp) to almost pin the mane clip in place in my hair. It held very securely for me. I have partied, gone to the beach (not swimming though) and worked out with my mane clip on. I have 3 of them, a black, brown and gold and all 3 have worked for me. HTH!!
You have to make sure the weft is in the middle of the 2 rows of teeth. So it won't stick out at the top. I just got mines yesterday and I already love it no weft showing or anything.