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Onother thing, when you get the lens out try to keep both lenses together as they are,they should have a set of arrows or a line drawn on the side of both lenses. This mark is very important as they are put together with an index mark and are tested as such. With both lenses aligned to each other they provide the best correction.
Also make sure the little shims on the edge between the lens is kept in place.These shims are a carefully measured item to provide a particular air gap between the lenses, this helps minimise spherical aberration.
If you keep everything in exactly the same place and orientation you should not have a problem.
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