I bought this router from B&Q a while back and finally got round to using last weekend. only for some reason I cant seem to get the chuck to hold in the router bit. I thought I may have made a rookie error and bought the wrong bit size but I've definately got the right size. I go to tighten the large nut as far as it would go but the bit isn't even lightly gripped in place. I think I might be missing a bit so have attached photos, if anyone has any suggestions they'd be greatly received!