How to fit single speed tensioner onto bike? I have recently replaced my old Gusset Bachelor SS tensioner for a new Gusset sprung tensioner with a jockey wheel (https://www.gussetcomponents.com/shop/chains-and-chain-devices/squire-ss-tensioner/). However I can't seem to tighten the bolt into the mount (the hole next to the drop out, where the tensioner attaches). I'll add some pictures to make it clearer. When I tighten the bolt with a hex key it just keeps spinning and will be loose, however if I take the spring mechanism out of the housing the bolts tightens just fine, so the spring is blocking part of the bolt to be tightened maybe. I'd appreciate any advice.
Is it a push up or pull down spring? As far as I know, the chain can be put in tension both ways, but a specific tensioner will work only in one direction (either pulling up or pushing down, therefore the chain should run above or below the jockey wheel.

Emergency fix: run the chain above the jockey wheel and zip tie the tensioner to the frame.