Custom heating beed arms

If you use aluminium arms like http://www.ebay.at/itm/271435645223?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 it might be an improvmenet to replace the plastic arms with this parts

Please note that the screw spacing is for the CTC clone printer not for the makerbot original priner