they have changed the overall design, from a steel sleeve with the bearing assembly-axle pressed in,
alloy spoke flanges screwed & bonded to the outside,
to a machined Alloy hub shell with a field serviceable axle ..
they're in San Jose Cal so you can call and email them directly ..
https://www.philwood.com/
about the axle end cap pieces to fit your frame .. and its drop-out spread.