Just got back from a job where a 114 chubb needed opening after going through every single combination with the pick and taking several impressions it still wouldnt open. In the end it had to be drilled but a hole already existed from a previous locksmith so no problem there.
The problem was that all the levers were lifting together so it made picking impossible and also halfway through the job the customer pipes up i had a go at opening it from the inside (he had already gained access) and it turns it he had been forcing the bolt.
It turns out i had found the combination after about 6 tries but the situation made it impossible, sidpicks was with me and couldnt believ it either but there you go, one of those things.
A straight forward job turned into a long one but if you guys can learn from this too then great.
So if you have tried all combinations with absolutley no pins binding on the pick you know what it may be.