guys dave at HRC has come up with a 5 in rail mount and will have it on his site in a few days....if u are thinking u might need one soon order one up....they are 45 dollars plus shipping....lets not let this company stop making what we need....
dave called me today to ask if my 1527 had the 3mm or 4mm mounting screws....never even checked that out....mine was made in jan/2014 and darn it has both 3 and 4 mm screw holes set at a different space apart so let him know all about your motor etc he says that only neu motors are doing this...I don't have a clue