For me those screwed pin removers are pretty much useless. I find I have much more control the traditional way, using a device to clamp the bracelet (this is a Citizen one and works VERY well) and then the Bergeon pins and holder. These are also available in a very expensive set that includes a based and tube for that holder to go into, but really you don't need that. The watchmaker's hammer provides all the persuasion necessary to remove and replace pins.
As has been mentioned, cleaning the bracelet before removing the pins is not a bad idea, in particular if the bracelet has not been cleaned in a while. The dirt that gets in there can be like concrete in some cases. If pins do not go in the first time and they jam and distort, it's most likely that the holes were not lined up 100% and the pin has hit the inside of a link. Once again the hammer allows me to feel things very well when the pins are going in, and I know immediately if I have an obstruction.
Cheers, Al
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