I've noticed that my front der. shift like crap in these cold weather. Granted this is a vintage '95 Deore XT bottom pull der which has seen 3 years of year round commuting and the rest as my first mountain bike. I've noticed the der doesn't want to shift from the middle ring to the granny when it's cold because the pivots are either frozen or so full of crap, I can't get at it. Usually I'll take some silicone spray or other kind of lube and spray the pivots and that will usually work for a bit, but I'm wondering if I can take the thing apart and really lube it from the inside or is it basically, throw it out and get a new one?