Mechanism to draw rear wheel back and tighten chain stuck; oil not helping, what's next? I have a bicycle with an internally geared hub (Rohloff).  To tension the chain, I loosed the attachment of the rear wheel (dropouts), draw back the rear wheel, and tighten the attachment again.  However, on one side, this mechanism is stuck.  I've oiled it but it's still stuck.  What can I try next?



This mechanism is supposed to move back and forth when the bolts are loosened, but it doesn't.  On this photo, I removed the bolts connecting it to the dropout completely, to make sure that isn't the problem.



Whereas on the other side of my bicycle, it does.

This leaves me with the choice of cycling with a loose chain, or cycling with a slightly less loose chain but a rear wheel that isn't straight.  Not a great choice.  How can I unstuck this mechanism?  I've already tried to oil it.

Edit:

The thing on the left (with a thread visible) is stuck.  It is supposed to be connected to the thing sticking out on the right, but regardless of how much I loosed the thing sticking out on the right, the thing on the left won't move.  Sorry, I don't know the right terminology.
I'm a little puzzled by the threads that look like they should draw the hub's axle back to tension the chain. They don't appear like they can move, but it also doesn't look like there is a nut on them to pull the axel back. Do you know if they thread into the frame, or are they free to slide?

That said, it appears that the load on the mechanism would tend to misalign the threaded part where it passes through the frame. This is very likely to cause it to jam. I think you could try very gently prying up on the loop where the axle attaches or perhaps tapping down gently on the top of the loop. It shouldn't take much force at all. I'm assuming that the frame is not threaded and that the adjuster should slide freely.