Dr M, what process did you eventually come up with to restore the Mentor version to NTSC?

A while ago I bought a Hong Kong DVD which was 29.97fps, hard-telecined with terrible field blending - probably a poor conversion from a PAL source. An AviSynth script called Mrestore was surprisingly successful in restoring it to 25 progressive frames per second.

Mrestore has since been superseded by a new script called Srestore; if you're happy with the current conversion, it's worth noting for future reference. On the other hand, if you feel that the current version could be improved, and you're tweaking the discs anyway, it might be worth considering re-doing the encode.