have you worked out a posh (easy) way to keep the lube in and the crap out of these un-sealed bearings ?
I was going to get them and then spend the time whilst they wing their way from the US looking at ways to do it :-)

im up to my neck at the moment so hopfully jonathan will pick this up... you will need two stepped washers making unless you can find belleville washers that are 22mm (just under 22mm so they clear the inner housing)
it is probably a good idea if you do a drawing so you can thrash out any problems you might have
I might buy a 50mm dia offcut of Ali and have a tinker on the lathe at work, will check to see if we have any boring tools to play with!