I am going to use the 20mm aluminum standoffs but I need one to be an eccentric though I am unsure how to do this with only the one size being available. Anyone have any ideas?
cut a stand off short so it + an eccentric = 20mm long or contract someone with a lathe to make you a custom eccentric from 10mm square bar, take about 2 minutes.
Can you give us an idea how you plan to use this. A wheel sticking that far out won't likely have enough stiffness to be of much value.
I just worked around it as I am designing a new machine and I am finding a lot of parts I wish was available in metal but are not so I am just going to 3d print them at 11mm thick. Thanks again.