Well, it's not in the shape it was during filming, that's for sure.
Those rails have probably come off and been RE-glued a hundred times, and I think it's pretty safe to say, they're not in the same position they were in when it was in "working", sliding plate, condition.
Nowadays, the philosophy is more likely "Let's not have these rails fall off EVER AGAIN, this thing needs to be tough to handle all the touring it's got ahead of it! But, heh, let's not sit down with it for awhile and actually attempt to clean it, restore it to its original state. Just add more glue!"
Those rails have probably come off and been RE-glued a hundred times, and I think it's pretty safe to say, they're not in the same position they were in when it was in "working", sliding plate, condition.
Nowadays, the philosophy is more likely "Let's not have these rails fall off EVER AGAIN, this thing needs to be tough to handle all the touring it's got ahead of it! But, heh, let's not sit down with it for awhile and actually attempt to clean it, restore it to its original state. Just add more glue!"