Re: Axis Pedal.... revealed
Pic#3 shows the retainer washer in the end of the 'Aux Head Assembly'. This would also be the same on the main pedal assembly, as Axis uses the same shaft, bearings and washers for both. Washer holds the shaft and bearings in 'number -one' assemblys.
Here in pic#4 we see the Axis shaft on top of the 'Auxiliary Head Assembly' in relation to where it would sit in the assembly.
Pics1 & 3 are important reference points, as they reveal two possible places (one more likely than the other) where you may find 'slop' in the workings of either the primary and/or auxiliary pedals. Slop which you may misdiagnose as being in the connecting (UDS) shaft between the two pedals.
To check for 'slop' in the system (on any double pedal), start with pedal's mounted in playing position on the drum(s). Grab/hold the beater shaft with one hand and the cam of the aux-pedal with the other, twist in opposite directions. If you feel 'play/slop' in the connection between the two pedals, there could be looseness in shaft-related places, or on the connecting shaft (UDS) itself, you need to find out exactly where the offending slop lives and make adjustments.
With Axis, the (UDS) connecting shaft is the easiest fix of all the possibles and should be checked first if you detect looseness in the system. To do this correctly you need to isolate the UDS by removing it from the pedals. Without it being removed/isolated, it can be fairly deceiving actually pinpointing where the slop lives. It may feel like its in the UDS, but could easily be in the one of the soon to be mentioned 'other' places.
With the UDS off the pedals, simply hold both ends and twist. There should be zero 'play' or looseness in the joints. If you find looseness on an Axis UDS, heat it in a 320 degree oven for 10 min. Remove (with pads, it'll be hot) and tighten the set screws on the loose joint. Before heating, inspect which set screws need to be tightened and be ready with the corresponding allen wrench Pic# 5 (below).
These pivoting joints are set in a block of LocTite which when heated, allows the set screws to be tightened/loosened. A brilliant Axis design feature allowing their UDS to be 'snugged up' to factory (or even custom) spec's by the user, thereby not forcing the system to used in varying degrees of decay (slop) till it becomes noticeably unplayable, as is the case with other brands which require complete replacement (no adjustment option) of a loose shaft.