Thanks guys for the encouragement. I don't think I'll ever be able to use a wedge though, Paul... my neighbours like to turn their lights on without warning! so it's snatch a few seconds here, snatch a few seconds there for me! Also I live near the train lines and everytime a train goes past the ground shakes! That's what caused the problem that looked like poor tracking with the jewel box... I only took two frames and the second frame had a bit of 'train-shake'!
I've got to say I love the idea of stacking several short exposures from an alt-az driven system. I'm going to stick with that and explore all its possibilities! ... for a while...
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