Diff lock wandered off

For the last few days I have had the front prop off, fitted a new U/J today took it a run still vibrating prop back off and now I cant get diff lock full movement at box even knocked it over with a hammer and drift to make sure no joy any ideas chaps, after a few hours of searching I found a referance to the warning light switch being wound in to far after a lot of swearing ets I wound it off one turn and its now sorted cheers all
Dev