I bought some JB solid core 65 lb in a yellow flavor. I'm going to thread my popper rod with it. It'll ride on a sweet 20K stella. I read on another board a post by JEP that stated he had been able to pull end loops into solid JB spectra. I decided that I would try it myself. I cut a section of 32 lb wire and made a puller. I found the middle and squeezed the loop as small as I could with pliers. I had little problem inserting the wire into the 65 lb JB "solid" spectra. It is small and not an easy task. I have some experience with hollow core JB and wire loop pullers. This experience was needed to thread the "solid" core onto my wire and form a loop. Let me sum this up... IT WORKS. I pulled an end loop into the 65 lb "solid" core spectra. It was not the fastest thing I have done. I can see me tying a bimini twist when the bite is hot. Given time.... I'll pull an end loop. The end loop is a 100 percent "knot".