Here is the elusive cam button.
Regards, Neil Tucson, AZ
Sorry to keep raining on your parade Neil, it's not intentional.
If you are going to install the thrust button now you need to do a few other things first. This type of thrust button requires some thrust (no less then .010 but ideally no more than .020 IMO) but this means you need to check it. The correct way to do this is when you start the assembly of the engine before the cam plug is in place. But you are beyond that point. So now I would remove all the pushrods so there is no load on the cam, install the bearing & front cover then reach through a lifter bore (after you remove a pair) & using a screw driver on a lobe load the cam forward & back to make sure I have a reasonable amount of movement, not too much, not too little. Especially not too little! At this point it will be your best guess.
Really sorry to keep being the guy who brings a dark cloud.
Neil,
I also am sorry to keep offering possible solutions, "after the fact" . . . . . .
My suggestion is that you take some time and make a list somehow, (I use an Excel spreadsheet), of "check list items", in the order of engine assembly. Do this now while the memory of how things should be done, is fresh in your mind. It does not have to be "the perfect list", just a starting point incorporating what you know now, items can always be added or revised. The great thing about an Excel spreadsheet is that it can easily be "revised" as you go forward. I suggest you break it down for every operation, no matter how small or seemingly "unimportant".
I think there are several of these available online. Might require a bit of searching though. Then just modify it to make it yours.
If you use it as intended, then when you come back to assembling after some "hiatus", you don't have to try to remember where the heck you were and what is done for sure.
It's intended to prevent all those "arrrggghhh" moments . . . . . .
Diligence about records DOES add time to the assembly process. But I find it helps to provide a better finished project. And can add "piece of mind" . . . . .
Mark