Converting a rowing machine into an erg

A neighbor of mine has a rowing machine that he can sell to me for cheap. I am wondering if that can be converted to an erg.
There is this video here for example

Anyone has done something like this?

Thanks.

I have seen some info on this at rivermiles.com on the forums.

A friend of mine who works at Concept2 makes adapters in his spare time. The canoe adapter goes with the rowing ergo and is a beautifully simple thing. The current kayak adapter goes with Concept2's SkiErg and works very nicely. They previously did a kayak adapter for the rowing ergo but it was not great.
www.paddlesporttraining.com/

diypaddleergometers.wixsite.com/build