If you don't need too much then just drilling a hole in a piece of thick steel will possibly good enough. Assuming you will sand the ends flush with the job the the none of the surface generated by the jig will be visible.
Otherwise turn some up in a lathe perhaps.
Lots of of ways to skin this cat without buying a fancy overpriced jig from LN
Round over bit in a router,table mounted,a few passes you have a dowel....or get a knife and a piece of walnut and carve one
or go to the store and buy a piece.