Anet A8 x-belt tensioner for idler with 5mm shaft

I needed a tensioner for the x-belt on my Anet A8. I didn´t find one which would fit the idler that I bought which is larger than the regular one and has a 5mm wide shaft, so I decided to make a new tensioner inspired by several similar existing designs. The tensioning bolts I used are M5 sized with 8mm heads, for which I made some knurled caps for adjusting them by hand. The caps are a tight fit to prevent them from falling off. It might help to slightly heat up the bolt before attaching the ca