how to take measurements properly

hi

im soo new to this scene. I have a question about how to take the measurement of my slinky properly. What i did the first time i do the jelq exercise I took the measurement on the upper surface of my slinky with a tape measure. i let the tip of the tape measure touch the skin of my pelvic skin area and measure it until the whole in my slinky. is this the right way of measuring the length of do i need to press down to the pelvic bone to get the right measurement. thanks.

LOL @ slinky

I just started using that word. I was thinking about a name for one of my pets and woke up the other day with the name slinky in mind but I didn’t know what it meant. I especially didn’t know it means penis! LOL it’s a funny name