Thanks!
Online Metals has brass tube in .04" thickness (1.5" OD, 1.42" ID). It won't slip over MHS parts...you notice all of my parts are cut lengthwise. After you do that, it slips right over and you can drill and tap screw holes. I used #2 - 52 screws and a tap to attach it.
http://www.onlinemetals.com/merchant...=84&top_cat=79
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