Sweep beginners question

 From:  Jake
10126.1 
Hi there,

I hope this is the right place for this topic. While trying to work with the sweeptool, I cant get the desired result. Though I have both starting points centered
I cant get it the sweep along the rail to where I want it :see my blue overpaint. I tried all kind of different adjustments. What am I possibly doing wrong?

Thanks for any advise where to ask and how to get up and running. Yes, I watched some of the beginnerstuts. and I am on MoI 4

Best Jake