rotor end blocks may be installed or removed from the rotor core 200 radially through the vane and rotor access opening under vane and rotor access cover 224 in this design there is no need for removable end plates as were required in the versions with slide blocks 212 or rollers 226 shown in fig3 b and 4b respectively fig3 b is a sectional view showing the vanes 242 and rockers 234 mounted on axles 236 with bearings 238 and secured by stainless steel snap rings 240 all moved to the extreme left hand position rockers 234 are designed to have a rolling surface corresponding to the stroke length of the vanes the centerline of the rocker axle 236 coincides with the location of the vane 242 vertical centerline and the location of the guide cam 96 and follower 98 when the vane assembly 242 is in the extreme left hand position when the vane assembly 242 moves to the extreme right hand position the centerline of the rocker axle 236 follows and stays aligned with the guide cam 96 and follower 98 the rocker 234 bears on the retainer ledge 210 shown in fig3 a and is always in compression the relatively large radius of the rockers 234 compared to the shorter radius of the rollers 226 shown in fig2 b reduces the amount of rotation required to achieve the necessary motion required by the stroke of the axial vane rotary device fig3 c is a sectional view taken at 90 degrees from the view shown in fig3 b and shows the vanes assemblies 242 moved to their extreme right hand position rockers 234 have also moved to the extreme right hand position in the.