AK Sight Tool
Whether you build or buy, make sure you have a STURDY yoke. This is the "C"-shaped part the tool that acts as the "anvil".
I had a SAR-1 that had the drum really frozen AND staked in the front sight frame and it bent the TAPCO tool like a wet noodle. In the end, I had to use an automotive steering wheel puller (much bigger screw AND stronger frame) with a mallet to get it loose. And even then, I had to totally remove the drum and reduce its diameter so it was no more than a snug fit.
Only then could I use the TAPCO tool (hammered back into shape). Not blaming TAPCO, just relating my experience.
Good luck,
MR2