bias plate

I had a problem with the bias plate on my 200 tdi a few weeks ago,it turned out the actual plate had moved over slightly so after having the console out and getting to the plate i moved it back to the correct posistion and thought job done,however 300 miles later and the thing has moved again would loc washers or a small amount of loctite help to cure this or has anybody else had the same problem?any suggestions would be appreciated.

I have just changed my plate and springs using blue loctite for the bolts, It's not moved
so far, about 500 miles of mostly town driving, A bit of a bummer to do it a second time!
regards
ivor