i do know how to string guitars, but mostly electric ones (my one has a fixed bridge). I tried to find information about it and there is none to be found.
The pins on my Martin insert easily and stay fixed during the string installing, but with my J45-50 Gibson I must insert the string and then the pin and, while tightening the string to less than pitch, I rest the heel of my foot over the pin to keep it stabilized until tension keeps it in. My three steel-stringed acoustics have the bridge pins too. I have taken it off once and re glued it with Hide glue, but even after waiting the prescribed 48 + hours to restring it let loose as soon as I tuned the guitar. Leaving a guitar in a hot environment can cause glue to melt or dry the glue out. I have no opinion on "vaccume clamping" as I have not tried it as yet. Guitar bridges lift off the instrument top for several reasons. Braces may have cracked or come loose.