He also said that if one got jacked up he could just fix it. So take that for what it's worth.So Nonliberal says it seems to work with a 4 inch can. What about some of the modular 22 cans that can be shortened below 4 inches? Maybe not as quite as quiet, but seems like maybe would work?
I do not know the answer to your question but I did it with success from a 4 inch can.