Been using 5/8” all thread for a temporary axle . Bought two short sections of 5/8” rolled steel . What I have found , is most mini bike wheels . That are wheel rim and hub , don’t have a spacer between the bearings of the hub . What that does, is no allow proper clamping of axle . Puts to much internal pressure on bearings . After 50 plus years those bearings where pretty much toast . Visited local bearing house for new ones . Ground down old bearings to use as test fit bearing for center tube spacer . Got that handled >>> I forgot to take pictures <<< sorry guys . The new 5/8” stock needed some threads . The one tool I wish I had is a lathe , kinda needed a lathe for clean threading . Being i don’t have that , I used my drill press . Lower table down and chucked up the 5/8” . Set up my 5/8” fine die , I am doing this in this manner . So get clean square threads . Rotated spindle head down , with die in a handle just below the 5/8” . I used a large bungee cord attached to one handle arm . Stretch down base of drill press . That put constant pressure on die and 5/8” rod . Dropped off the drive belt on pulley system. I used a 1 1/4” socket and ratchet to turn drill spindle . This crud goofy set up works very well . You get nice square cut threads , I also broke down the Homlite to take it a new powder coater . Went in to sticker shock forks /two piece frame / and two seat brackets in tangerine orange $350 WOW .