Hello. I just got a Canon FD 50mm 1.8 off eBay. I also ordered a Fotasy FD to m43 adapter from Rainbowimaging. I've looked at a few other posts and watched some Youtube videos, but I cannot get the lens to fit on the adapter. I can line them up right (I think, anyway) but the lens doesn't ever sit flush with the adapter and I can't lock it. Is this an FD/nFD problem? I'm not really sure which one I've got here. Any help would be appreciated. Even if that means a different adapter.