Starhub late wideglide axle help

[kboschphotos]

I got a later showa front end that I wanna put this old star hub I have on I ordered the step axle kit with sleeve for the wheel all is good but the threaded end of axle has wiggle room in the lower....the sleeve doesn’t fit in fork lower cause it’s not a panhead fork... so I need a sleeve or something inside the left lower to make the smaller part of axle the nut goes on tight

Anyone no the diameter?i don’t have a micrometer would I need a 3/4 to 5/8 reducer?
Right now I have a dual flange wheel with 3/4 axle
I attached photos thanks I found these on amazon
Also I will have to cut the sleeve from step axle to act as a spacer