Take a look at the photo, you will have to imagine the block in the middle (name?) is on bearings, and slides on the steel bars across the gantry. So the question is what is the best place for the leadscrew? The problem is, i have only 16mm gap on the insides of that sliding block, so I will need to use 1/4" screw if it is to be inside. Ideally, I would like to put it on the bottom of the block, where I can use a 10mm screw, which I have already (I say leadscrew, but it is really threaded rod). I'm just worried about excess pressures on the screw if it is in different areas. I hope you know what I mean