Bike rack problems.

[dubLU]

I finally got round to purchasing a bike for my t5 era bike rack, shamefully taken me 3 years. I have run into a problem. As I unwind the knob to open the clamp jaws the threaded rod, which is fixed into the knob, unscrews from the bolt in the frame attatched plastic assembley. Should the knob be unscrewing from the thread at it's end of the rod rather than turning the threaded rod causing it leaves it's securing bolt?

 

[drinfinity]

Should the knob be unscrewing from the thread at it's end of the rod rather than turning the threaded rod causing it leaves it's securing bolt?

Yes. Typically the knob seizes onto the rod. Lots of penetrating oil, and maybe mole grips to hold the rod, and hopefully you can free the knob off. Then a dab of grease will stop it happening again.