In the illustrated embodiment, this is accomplished by mounting the timing disc 51 on a keyed shaft and providing {TAIL ~ a plurality} of {HEAD ~ offset keyslots} on the disc 51 
In the illustrated embodiment , this is accomplished by mounting the timing disc 51 on a keyed shaft and providing { TAIL ~ a plurality } of { HEAD ~ offset keyslots } on the disc 51
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH