Hey Tony, If you are reading this.
I had a crack at replacing one of my PBG ceramic magnets with an A5. Followed these instructions, which are brilliant I might add.
I can see what you mean about the thinner A5 magnet. I intend to wax pot them (20% bees wax and 85% para) as soon as I've done all 4. However, you you think I should shim the A5 magnet with a bit of plastic or something? or will the wax be enough?
Also do you/can you replace the plastic tape around the coils?