I mentioned the issue of running into the bracket in this post -
http://www.buildlog.net/forum/viewtopic.php?f=4&t=406&start=20#p2787 I also said I would post pics and seems I may have forgotten to do that.
Looking back at the photos I took, I know why - a couple were very out of focus and I never got around to retaking them. But I will post them anyway for anyone that cares to see them - you'll get the idea.
First - why I did NOT move the bracket to the top. When I discovered the movement limitation, I was going to move it, but realized that doing so would make it impossible for me to drop the front v wheel off the v rail if I ever had to remove/reinstall the gantry. So I opted for this solution.
I modified the idler bracket to allow it to mate up with the angle bracket - giving me about 7/8" more room.
[photo 1 - old and new idler bracket form]
[photo 2 - old and new idler bracket form - better angle]
[photo 3 - placement with original idler bracket]
[photo 4 - placement with modified idler bracket]
The modified idler bracket has since been straightened up a bit and mates nicely with the corner brace. I just don't have a photo of it.
I cut the wedge out with a hacksaw - really easy to do. Note that I also moved the keeper screw to allow max removal of the material.
I don't necessarily recommend this method to everyone, but if you feel like getting a little extra gantry movement, it does work very well.