Just looking I know rhe position of that coupler tack would cause issues on some grade's transitions.
On shorteng small machine screws: take a close look a some common plier type wire strippers. On many, you'll see threaded holes. These are for cutting screws to length and work surprisingly well. Often better than the wire sripper portion.
I usually trim them two threads long and file or grind the cut's pinch on the tip properly, especially on fine threads, but not always. The cuts just vary a lot in how much the pinch changes the tips threads. The screw's go into the threaded half of the pliers first. These threads keep the screws threads straight.Backing the screw out after the cut also ensures they are ok too. But the lead thread is often jagged and needs filing to start well.
It simplifies supplies too. When I buy hadware under 1/4" dia. I just buy one big box of the long ones for each number & thread, most in pan head, and some common V head sizes,, then clip and trim them as needed. If you search a bit, you can find metric pairss A sloppier cut is still possible in an oversized hole but likely needing fileing/grinding to get it to start into nut threads again.
