Hi and Thanks, Bob!
Funny you should ask...I tried something new this time and though I think I need to tweak it (my wheels are marginally too big in diameter) things worked out well. I went to the local hardware store and bought several o-rings, roughed them up with sandpaper, hit them with grey primer which (to me!) approximates a good rubber color. I then made the hubs from two cross-grained 1/32nd sheet and glued the o-rings around the hubs. You can see things as they stand now.
I do think the wheels are too big. I also think that the spreader bar is not long enough so my Pfalz sits a tad high. I'm going to redo these parts, but you get the picture here.
I also got the prop blades on the spinner and it's amazing how much more finished she looks now.
Still more to go but the finish line is in sight!
Cheers,
Dan