User ID wrote:
If selling the lens, with or without the filter, I will always unsooper undooper untighten it properly back to normal.
As mentioned elsewhere, if plastic lens threads are involved, there could be a step up ring involved as well. This way the lens threads are like new. Likewise with any reversible hoods.
Step-up rings are a good way to keep costs down and keep your filter set one size. A good polorizing filter can be expensive if you are using different filter sizes. One disadvantage is their bulk size.