Trigger pull on Century Tantal

[mak47]

I have a century polish tantal that I absolutely love. It's totally reliable, doesn't keyhole and is accurate.

The only issue I have is the trigger. It's super smooth, which is great, but it's really, really heavy.

I'm guessing this is the result of a heavy hammer spring which could probably be replaced with a lighter one.

The problem is that it has a selector on the left side of the receiver as well as the right. On most AK's you can just swing the safety lever up and pull it out, then disassemble the trigger group. This one doesn't come out that way.

Anybody know how to take this thing apart? I'm totally lost. I've searched the AK forums for an answer but can't seem to find one.