Convert PDP-11 RK05 disk pack to PDP8

I've been going through a lot of RK05 packs lately and found that an easy way of telling one from the other is that two sector marks can be visible within the approximately 1.5" gap for an -8, whereas only one can fit for the -11. Of course, turn the hub so that you're not looking at the index area. :) You'll see three slits for the -8 and two for the -11 there. Just thought I would share. Do I understand remounting the hub to be as easy as getting the disk centered by ensuring zero runout on the edge? For those who have experience with cars or firearms, measuring the runout with a dial indicator should not be a problem, I imagine. I haven't opened up an RK05 yet, but can you utilize the spindle for this procedure, or would it be better done externally? That leads to another perhaps relevant question: cleaning. I hear people have successfully cleaned these in the kitchen sink. Is deionized or distilled water preferred over tap water? Any tips on this? Non-powdered latex gloves should be worn, I imagine? We can start a new thread on this if one would prefer. Kyle