I used a standard murex tip and tip holder and shortened both from both ends .My shroud /shield can slide a bit . I am not sure if the tip was a bit to close to the work or my tip was too short (i took a little more off it) ,but a small glob formed on the tip a few times welding the smaller bore welding the wire to the tip .
How best should I setup the boring bar for parallelism to other bores ?
I got cones made ,but differences in wear and ovality between pairs of bores and when the pair are close together are a problem.
I know I said I am done a while ,but I am still boring and welding away in my noggin .