If you want to make these progressive without stuttering, you may want to consider doing a manual IVTC to remove the pulldown. This can be done fairly easily with AVISynth and VirtualDub (both free software). It's a little time consuming, but there's less chance of error.

Assuming you're starting with an AVI file, start by separating the fields in an AVISynth script.

Example:
avisource ("yourvideo.avi")
separatefields

Next, open the script in VirtualDub. Find an early section with some obvious movement (like the flying "Star Wars" logo)...and then get ready to start counting. The goal is, out of 10 frames (actually fields), to figure out the duplicate "junk" frames and eliminate them. You want to change the pattern from "2,3,2,3" to "2,2,2,2". I'd recommend starting with a frame ending in "0".

Once you have the pattern counted, use the "selectevery" function in AVISynth to specify the frames you're keeping and then "weave" them back together.

Example:
avisource ("yourvideo.avi")
separatefields
selectevery (10,0,1,3,4,5,6,8,9)
weave

Then, just scan through your video for any combing. When it appears, the pattern has changed and you'll need to go back and figure out a new IVTC pattern for that next segment.