I was having a hard time keeping the chain tight and square on my son's Coolster 125cc atv.
It would get loose and fall off every time he rode it, so I came up with this easy fix.
The two stock fasteners on the top of the axle assembly were sloppy through the fastening ears and they wouldn't keep things square or in place.
I decided enough is enough and replaced them with this 1/2" all thread modification.
All it took was a piece of 1.5" all thread, four 1/2" nuts and 4 lock washers. I've done this to the other two I own and it has fixed the problem. Thought I'd pass it on.



Hope the pic can be seen

 

Good idea..
I ended up taking the stock alignment screws off (the ones in the bottom of your pic) i found they were letting it slip when trying to tighten. Much easier now

 

Yes sir,
I had a problem with the threads stripping on those, so I re threaded them to 1/4-20 sae, added a spacer between the nut and bracket.
Issue solved.