I've had very good luck bringing back dead or dying STI shifters and trigger shifters having been successful 6 out of 8 times. But I 'm having trouble bringing back a formerly dead STI to a nice smooth operating unit and I would like to know what lubricants other BF members have used for this job. Here are the details.
A fellow BF member picked up this shifter set from a used bike. He soaked it in solvent, (mineral spirits I think) and was successful in getting the unit to engage. I obtained the shifter set, and noticed the right shifter would bind when it engaged in a downshift requiring my full hand on the handle to shift. Upshifting with the paddle is no problem, nice and smooth. I sprayed the inside of the shifter repeatedly with Finish Line Teflon Plus, the lubricant I've successfully used to repair other shifters in the past. The Teflon Plus worked to some degree as the binding is now reduced, but not completely gone. I only need two fingers to shift, but it's still not smooth like my other STI shifters.
My question is, has anyone used another lubricant such as spray oil with any success to lubricate one of these units? I'd like to bring this shifter all the way back to completely smooth operation. Thanks for your time.