the Kreg Jig Support Stop bought as a separate item comes with with its Mini Trak t-Nut and Mini Trak Bolt. The Support Stop that came with the Kreg Jig K4 start set did not come with the nut and bolt. I used an M5 x 20mm bolt and nut. Taking the hint how the actual Mini Trak T-Nut keeps the nut in place when tightening the bolt, I used scrapped wood drilled with an 8 mm hole, encased the nut in this hole, chiseled the wood to size, and glued overnight. Sanded the assembly to fine tune fitting in the Mini Trak.
also possible to use cut-to-size Lead and to solder the "nut" into the drilled 8 mm hole.