It's interesting how this thread gets a ton of posts when the weather is nice but when cold weather hits many of us complain about how cold it is and how they won't be able to tinker on the old bolt until it warms up.
For you guys located in the colddddddd climates and are able to keep the bolt inside, I would suggest getting a propane heater to be able to continue all this work. They are not every expensive. Mine will carry me through the cold months and half of the next year.
http://www.heatershop.com/images/mh12t_big.jpg
This one costs 42$

~Jim