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maybe look for motorcycle bar ends: http://www.getgeared.co.uk/lsl_aluminium_bar_ends_22-2mm_dia_18mm
propably more and cheaper choice on ebay far east.
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I don't think the end of those is 22.2mm, they only mention 22.2 as motorcycle bars also come in 1" (25.4?) diameter.
Other problem with motorcycle bar ends is that they are gonna be heavy, they make em that way to cancel out some of the vibration you get through the bars. Probably neither needed or wanted for our application.
Dang, I couldn't find 22.2 anywhere else.