I had a FW I wanted to clean and rebuild but only have one chain whip (home made but did not want to make another and I don't have four hands). I also have plenty of scrap chain from 'curb appeal' bikes. I realized I could take a length of scrap chain, wrap that all they way around the large cog and clamp (mash) the two ends together in the vice jaws. Then I could put the proper whip on the small cog and turn it free. The vice held the FW solid while I concentrated on the whip and the small cog.

I'm having no trouble opening up FWs and re-lubing them. Easy, really. Just take your time and work over a tray or an egg box to catch what drops.