Ok, I've found out the hard way. It's impossible screwing a monorail straight onto a tripod without struggling forever just to get it to sit right. Although I can correct the horizontal and shift the front standard, it still isn't easy so I'm looking for a tripod head.
I've seen a lot of people use ball-heads, but for something like a monorail, it must cost a fortune. Be interested to see what the forum users make do with. I quite like pan-and-tilt heads with smaller cameras,. and feel tempted to get one for the monorail.
No idea what's out there on the market. Suggestions? Recommendations?