SolaVeritate's post in Battery keeps popping out was marked as the answer
This happened to me recently when I tried to change a renata (orig battery) with a cheaper AG1 battery. I found the top edge of the AG1 was slightly more rounded than the renata and it kept popping out.
I ordered another renata and had no problems.
SolaVeritate's post in Ricoh Medallion - Strap Adjustment (and cosmetic) Advice Needed was marked as the answer
Resizing the bracelet is the least of your worries.
I wouldn't run a watch with loose parts inside the dial/face.
SolaVeritate's post in Broken bezel was marked as the answer
There are literally thousands of replacement bezel inserts for a multitude of different watches from the customization scene. You will need the exact bezel size and send out some messages/mails to the customizers selling the parts. Your bezel might be exactly the same size as a Seiko or Boctok for example.
SolaVeritate's post in What's the best way to crack open a case with no grove for the knife ? was marked as the answer
A photo would help.
Be careful it isn't a 'screw off' back.