Thanks for taking the time to post details of your procedure. I didnt know that you could dismantle these tappets because I was misled by the 'H' manual that said they cannot be dismantled!!
I have added a couple of my own suggestions here based on my experience so far.
To get the plunger out of the body, most of us would prefer not to use a hammer, so as an alternative that works, just tap the whole body sharply onto a flat block of wood a few times until the plunger is nearly out, then you can easily pull it out with your fingers or some pliers.
When I got the plunger out, I didnt find much muck in there, but I noticed that if you look into the plunger (wash oil away in petrol first), there is a small ball bearing. If you depress this with a thick wire tool, a lot of sludgy oil comes out, and unless you do this, the sludge may be difficult to shift as the ball is spring loaded and seals the sludge inside. Immerse the plunger ino some petrol, and pump the ball bearing a few times to clean it out.
Thanks again, and I hope my bit helps to improve the effectivenss of your procedure.