OS FS 61 break to fix

It was an engine from eBay. Moderate priced OF FS 61 engine, with remarks "used". I was greatly and negatively surprised, when was dismantle it.
I'm still have few engines - "disasters", but I've never got engine in such terrible condition. So, I've tried several methods , how to pull out the staked piston pin. In the most of OS engines, piston pin becomes a "key" for an engine, if you are unable to pull it out - you can't continue to stripe down the engine, so, you can't fix it at the end. I'm really make a crime - to cut out part of a conrod, to continue engine dismantling. But if I don't cut it - engine will be stayed as crap for an endless time.
The rest you can watch in this video. I'm asking you, if you're knowing some secrets, how to pull out piston pin in OS FS engines, to share it with us.
It is really the key, how to fix an engine.
Thank you very much for watching !
Have a nice day !