Ultegra 600 STI downshifting slippage
I'm running ~13-year old ultegra 600 group-set on my race bike right now, and it has been working quite well. However, of late, I have noticed that on the right STI, on the inner paddle to shift to lower gears, it doesn't seem to catch and I have to pump the lever several times to get the rear derailleur to shift. Is this problem fixable, and if so, how?
At the suggestion of one of my other team-mates, I sprayed a little bit of T7 in one of the STI hole openings, in hopes that it would free up slippery and clogged up STI mechanisms, but this was not very effective.