Just in the process of doing mine - have the two bolts through the top of the scuttle, which are symmetrical and will put black plastic covers over them. Should look fine.
I thought about trying to avoid the bolts through the top thing, but the mechanism is so heavy, any other way of doing it would require so much reinforcement to keep everything it the correct position, that I thought it wasn't worth all the hassle.
With the spindles poking through the holes, and everything in place, I found that there wasn't actually that much room for adjustment - just keep the spindles from rubbing against the holes.
But - I haven't fitted the screen yet so can't confirm that it all works fine yet.
Let us know what you decide to do, and how you get on...
Cheers
James