I don't know the exchange rates, but Tower Hobbies shows a complete new engine for that for $95 USD. So hopefully it shouldn't hurt the wallet too much.
I haven't a clue why it would stick at the bottom. That being said, I would think that if the block is good, you could rebuild it. New piston, sleeve, rod and bearings. Sometimes it is more cost effective to get a new engine though. I don't have any personal experience with that model, so...
Welcome to RCNT! I'm sure you'll find all the info you need and some more. :cheers:
What you've described makes me want to think someone didn't understand "pinch" and got frustrated. When you rotate the engine by had, you should get resistance nervous the top of the piston stroke.
We have a...