jrhoffman75,
"(though he does warn that it’s “not recommended for the faint of heart”)."
Not recommended for the faint of heart? 
It should have read not recommended for anybody.
The problem at hand is to try and preserve the integrity of the gear. Not destroy it in the process.
@ebiggs1 wrote:jrhoffman75,
"(though he does warn that it’s “not recommended for the faint of heart”)."
Not recommended for the faint of heart?
The problem at hand is to try and preserve the integrity of the gear. Not destroy it in the process.
Quite so. But if you're not willing to consider penetrating oil (and maybe even if you are), it may simply be impossible to get the filter off without breaking something. And if you're going to break something, it's usually better that it be the filter than the lens.
As for me, I'd send it to be repaired, if the repair cost isn't greater than the replacement cost of the lens.
Now, Robert from Boston,
Somehow 40+ years tells me penetrating oil and/or a hammer near the front element of a lens is not a good thing. Maybe that's just me but I really don't think I will be recommending either. You on the other hand are free to try it. 
@ebiggs1 wrote:Now, Robert from Boston,
Somehow 40+ years tells me penetrating oil and/or a hammer near the front element of a lens is not a good thing. Maybe that's just me but I really don't think I will be recommending either. You on the other hand are free to try it.
Well, I hope I never have to. Part of my prevention regime is that I don't attach a filter unless I plan to use it in that photo shoot. Then when I'm done, I take it off and put it away.
One potential problem is that if the two sets of threads are composed of different metals (steel and aluminum, for example), it can set up an electrolytic reaction that effectively fuses the two objects together. Good luck getting them apart without resorting to measures that might greatly offend your fastidious self. 
