Okay, here's the new version of the strap button things. Found a photo for replacement parts to use as a guide. Terrible photos. I also did a screw, not threaded, though, so use your imagination ;-)  I could do the threading if absolutely needed... not too easy since it's not an automatic process in Solidworks. For that I would have to make a spiral and do an extrusion-cut, along with other things.

So here's a new image. I would like to shift gears to look at the bridge and start thinking how i'll do that.