Yeah sounds right, i might use an empty pen as the tube.
Im hoping theres enough room in front of the vernier gear once its fitted to get an allen key onto the adjusting bolts. Might have to grind down an allen key maybe....
Im just hoping that my 5mm measurement on the cam gear above the head is correct and that im doing the right thing bringing it forward 2 degrees or thereabouts.
Ive heard that machining the head and using a thinner headgasket can muck around with the cam gear mark, but not sure if that actually moves the position of the cam or just creates that illusion.
Will try get some pics & maybe a doco, and maybe someone might find it useful