Creative fixes... no pulley for Front Der.
So, in an effort to bring only one bike to my parents for the holidays, I loaded up the 'cross bike and a few parts to make the conversion from single ring 42 to 50-34 compact. Alas, after I got the new crankset, chain, front shifter, and cable on, I realized I had removed the pulley that allows you to run a bottom-pull derailleur with top-tube cable routing. It's back home, hundreds of miles away.
I can adjust the derailleur using the limit screws such that I could use only the 50t for road rides and only the 34t for singletrack. Or I could remove the derailleur all together and shift by hand, but based on my experience with single ringness, I'm concerned that it's serving an essential chain-keeping function. Obviously, though, the best option would be a rigged replacement pulley that would allow me to use the shifters.
Anyone got a convenient fix I haven't thought of? I've got a hardware store at my disposal, but the LBS isn't open on Xmas eve. TIA.