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If you are buying and installing a new main spring it should come ready coiled inside a washer to a small enough diameter to fit into the barrel. You just place the spring/washer onto the barrel so that the wall of the barrel is supporting the washer and then carefully and evenly push the spring through the washer and into the barrel. Push the outside coils of the spring not the middle and it should just pop into place. Make that you place the washer the right way up so that the spring coils up in the right direction (clockwise or anti-clockwise) as you only get one shot at this the easy way.

I did it (first time ever). Yes I am bragging ! Small victories need to be celebrated ! Go slow, be gentle, make sure it doesn't even look like it will kink. Start with the outside and go slow. My fingers were killing me when I was done. I used a technique similar to the one in the video for undoing the spring, but backwards. Your thumb holds the spring down, and your free hand gently pushes the spring in the barrel about 1/3 of a turn. Then you slide your "holding" thumb 1/3 of a turn to hold the spring down, and you do the other section. I'm gong to do another one next week... I'm already stressing out about it !!! :)

Yes, I can confirm that the wavy 'S' shaped pattern is indicative of a faulty escape wheel. Have you checked the pivots are not bent? Also an idea to check for hardened debris in the pivot holes. I have also seen this when there is a little play in the pallet cock so when you place the cock back on the movement the pivot holes do not line up - I needed to keep adjusting it until I got it right. You could also mount the escape wheel in your truing callipers to make sure it is not out of whack. As far as +-15 secs a day, it depends on the owners expectations. If I take on a vintage watch for repair and it is in poor shape I will usually tell the customer that excellent timekeeping may be a stretch and I explain the difference between servicing and overhauling which are two quite different jobs. For example you can get an old classic car and make it run with a service and some tweaks but if you want to make it run like new it's a whole different ball game :D

Thank guys :)

I just Watch your latest video Mark.. thanks for it and very useful :)

Just watched the video and fair enjoyed it, roll on part 6.