In addition to fitting a Scottoiler I'm going to balance the carbs. I'm assuming that the vacuum pipe I will use for the Scottoiler is the same one (on the rear carb) as the one I'd use in conjunction with the front vacuum take off for balancing (if that makes sense

).
I seem to recall someone posting a thread and pictures of the balancing process and the location of the vacuum pipes but I can't find it now despite searching. If anyone can point me in the right direction of the thread I'd be most grateful.
Also, can anyone tell me what the i/d of the vacuum pipe should be please.
Thanks....