Printrbot Simple Y Axis line tensioner w/ spring loading and indicator pointer

Tested. Does work. Was hoping to make it as thin as possible for the location, but sadly, it does reduce printable area by 10mm. I only printed one and it works well, but I had to drill the mounting holes slightly to get it to fit. I changed those holes to slots, so I hope they work without issue for anybody else that wants to make one. See my X axis tensioner for more details, tips.