A pharmaceutical deblister apparatus that has a chassis adapted to support a roller and a deblister ring support shaft is arranged to receive a pharmaceutical blister pack of a kind having rows of blister pack compartments. The deblister ring support shaft has a plurality of at least partially circumferential grooves on an outer surface. At least one deblister ring is rotationally supported by the deblister ring support shaft and each deblister ring has an aperture adapted to receive the deblister ring support shaft. The aperture in the deblister ring has an at least partially annular and radially disposed recess adapted to support a biasing element biased radially inward, When residing on the deblister ring support shaft, the biasing element causes engagement with the outer surface of the support shaft to locate the at least one deblister ring with a groove on the deblister ring support shaft.
