i teared apart 1 or 2 Tek probe, some of them maybe still working when purchased used i think. its just ringless BNC and the pogo pins enclosure can be 3d printed i guess... i think asking for cheap source will be a tough call since it is a Tek's property. am also want to build custom probe, but not for Tek's scope, i dont own one. i bought few bunches Tek's probe to see if i can salvage the GHz active tip end for general purpose scope, havent got time yet. ymmv.