13 when passed through the central opening the upper end of the sleeve 16 includes a mounting flange 17 which has two downwardly depending pins 18 and 19 which pass through openings on opposite sides of the central opening on plate 13 the transmission 14 may be lowered so that the shaft 15 passes into the hollow bore 20 of the sleeve such as is indicated in fig2 for some selected transmissions a spacer 21 is employed which formfits to the housing 14 or a component thereof when the shaft 15 is inserted through the bore 20 of sleeve 16 thus the transmission is supported and stabilized on the support plate and any load distribution is via the support plate and stanchions or posts 12 into the base 11 referring now in detail to fig1 and 3 another adaptor is illustrated for supporting a different transmission such adaptor includes a v bracket 22 which includes side flanges 23 and 24 that are slidably received within guides 25 and 26 located on the underside of plate 13 in fixed parallel spaced relationship the bracket 22 includes a bolt affixed to a portion 27 where the bolt is indicated by numeral 30 and the nut threadably engaged with the shank of the bolt is indicated by numeral 28 the bolt includes a tapered end terminating in a point 31 which is engagement with a conical depression located in the extreme end or face of a spindle 32 the spindle is carried on the underside of a plunger 33 and.