Thanks again Peter.
Bunnings this morning because I couldn't wait for the ebay Chinese connection.
Irwin Speedbor set up and a wooden chock to prevent the 'keep going' aspect.
Like a knife 'falling' through butter like it's not there.
Now to set up a vacuum to clear the chock and I am off and running.
Saving a good 10 seconds ( and a lot of pushing ) per bore which can go towards
my 100T saw's slower than anticipated cutting.