pins stuck in thorax

[weeplings]

Hi all!

I was recently gifted a box of perfectly spread + dried specimens ranging from cabbage whites to viceroys in fair to great condition - labels go back to the early 90's. 
I want to remove them from the pins but a share of them are stubbornly stuck. (I wouldn't imagine glued since it's only a portion)

Any advice on dislodging stuck pins?

I was told white vinegar may help if its a factor of rust, but will that damage the body?

I'd prefer not to rehydrate as they're so excellently spread already.

Anything wonderfully appreciated!

[nomad]

Unless you relax them a bit, I should imagine they may be difficult to remove. However, if you do not want to do this, by holding the pin and taking a pair of forceps, and carefully sliding down and applying pressure very carefully near the thorax, they might come loose, but this could result in damaged specimens. Certainly not a thing to do with rare or small specimens. Pins are far easier to remove on freshly set specimens, as one person I know, sets all his butterflies as uppersides, removes the pin, and replaces the pin in the same hole, if he wants to show the underside. Adding a tiny bit of glue to the thorax by the pin, so there is no movement. However, I don't have that skill, a number have.

[trehopr1]

Attempting to remove butterflies from pins without relaxing is asking for a pile of trash.... These specimens (albeit common) were spread when fresh and thus their internal fluids and musculature have dried around the shaft internally. Without proper relaxing you will bust em' up !
If they are truely well done in terms of their preparation then why in the world would you want them off their pins? Please don't tell me to stuff them in a "riker" mount....
Given the fact that someone took the time to do a well done job of their preparation it is almost "blasphemous" to treat such material with such dis-regard/ disrespect.

[exoticimports]

Use metal snips to cut the pin above and below, leaving the remainder in the thorax.