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Hi Mike, I dont use the tiny bubble - its impossible to see in poor light.
IMHO it's a lot easier to use a clinometer or level app on a smartphone, just slap that on top of the tripod. There are many free ones, and you can check/calibrate them easily to within 0.1 degree which is more than sufficient for the purpose.
When aligning I also found it makes a huge difference as to how accurately you do this - just using say a finder with cross-hairs is nowhere near good enough. Similarly using an eyepiece in the scope without cost hairs doesn't really cut it either. These days I use a cheap 20mm eyepiece with illuminated crosshairs in the main scope (the MK91 which has a focal length of 3100mm).
The eyepiece was a cheapie - nice illuminated reticle but the eyepiece is an erfle with hideous field curvature. Tempted to butcher it into a Plossl.
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