I have a Yugo BHO mag that has a dent about 1/4 inch above the bottom of the mag that is preventing the follower from being inserted. Normally, I would follow Soviet protocol and hit it with a hammer until it was fixed, but the mag is in mint condition and it would be a shame to do bang it up like that.
So is there another way to lift the dent up back to normal without chewing up the mag?
Wrapit in a towel, put it in a vice tight enough to hold it stable and flat, pry against the inside of the mag using needle nose vise grips at the spot of the dent?
Disassemble the magazine. Take a 12mm closed box wrench (12mm Craftsman works for me-your tools may differ slightly) insert flatways into the the mag body til under the dent. While in that position use a vise-grip as a lever to turn the shank of the 12mm box wrench until the OUTSIDE of the head of the wrench come in contact with the dented surface. Now, gingerly work the box wrench back in forth across the dented area to smooth it out flush with the rest of the mag body. The 12mm wrench OD is just about as wide as the ID of the mag body so you won't over do it. It won't make the dent invisible from the outside but depending on where the dent is, you should be able to make the mag serviceable. Insert the follower from time to time to check on your progress.
I learned this from a thread on this forum a couple years ago and I have had good results with the technique.
If worse comes to worst and depending on the size and location of the dent, you can drill a hole just slightly larger than the dented area to remove it completely as a hang-up point. Clean the edges with a file. Load mag and mark how many rounds you have loaded in the mag at your hew hole. Tell friends that its a super-secret round count feature only used by Russian Spetsnaz operators and gunshow jerky salesmen