I've cut-off the no-longer-being-used snap caps from a now-missing cover or cushion, I dunno what was there, but it's there no longer, they look like junk, and IF I decide I need them again, I will add them back on at a later date with new! The legs need some attention. The middle one broke off at the base, the sides need to be either re-mounted with new hardware or replaced with new.
Protect your eyes! I use a variety of items as necessary. The snap caps were not a huge item, so I just used my Dremel with a cut-off disc.
You can choose to use a cut-off tool, your prerogative. I feel that would cause more damage than it would cure. So, the Dremel is the way I went.
Caveat: I am not concerned with it appearing "perfect." If you are, then I am not the one to follow. I want it to be usable, durable, fixed RIGHT if not PRETTY. Plus, it's a classic boat, and it should show it's character and I embrace that, and leave some of the flaws in - but repaired and sealed properly!
The tool is grinding metal, take care of you and your surroundings. Most especially your eyes! I cannot emphasize this enough. Maybe the reason why is eye protection has been a priority in another line of work I did - I managed a shooting range, and let me tell you. When you have 'problematic' customers who come up to you and say 'I want to thank you - you and your staff saved me from eye surgery today by forcing me to use my eye protection,' you'll think about it. This customer, who previously had never wanted to wear his glasses on the range - became our biggest assist on the firing line. The customer's rifle barrel had blown apart unexpectedly and shot backwards into what would have been his right eye. It was stopped by his safety glasses, which he had just replaced on his person after one of my line safety officers had instructed him to do. They did this several times an hour with this gentleman, always with an argument.