Tensioning or replacing x axis belt

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Is there a way to tighten the x axis belt on this printer? If not, what is a source for replacement belts?

If you look at the other belts you should see a little spring tensioner, looks like the spring from a cloths peg.

I suggest buying a couple and installing one on the belt right next to the extruder.

Then you can retention the belt properly.

I'm actually about to replace all the belts with 10mm GT2 ones and all the pulleys with metal ones, I was actually thinking about designing some adjust tensioners as I think the current setup is actually pretty bad.