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In the next video I will show you a VERY easy way of finding where to position the hairspring should you have not recorded the position before removing. After some practice you could find that the watch is perfectly in beat with no further adjustment (but not always) :)

I have uploaded a second vid on Hairspring manipulation - this time the hairspring is twisted up and down. View here!

Before you remove the hair spring you should make a note of where the stud sits in relation to the impulse jewel as this is essentially what governs whether or not the balance is in beat. Either make a sketch or what I do is to make a tiny dot on the rim of the balance with a fine OHP dry pen where the stud is (dry pen is great as it just wipes off when you're done). When you reassemble just make sure that the stud sits exactly where it did before, that way, assuming that the balance was in beat before you started it should still be in beat when you're done. The same applies when it comes to adjusting beat error at the collet (if the hair spring stud location is fixed an not adjustable). With all main spring tension removed and the balance at rest, sight from the pallet fork pivot to the balance pivot and see where the impulse pin sits. It should be exactly on the line between the two pivots. If not then dot the rim of the balance (dry pen) at the point where a line projected from the balance pivot through the impulse pin would intersect the rim (in other words the point on the rim which would also be on the line between the two pivots if the balance was in beat). At the same time you also need to dot the rim where the pivot line actually crosses it. Now when you remove the balance to adjust the orientation of the hair spring at the collet you have a fairly good indication of how far and in which direction the stud needs to move. I hope that makes sense (I should have drawn a picture, video is beyond me). I actually do all of that with only the balance on the main plate before removing the pivot jewels prior to cleaning. That way I get a much clearer line of sight with everything else out of the way, and any residue from the dry pen that doesn't get wiped off is washed away in the cleaner.

Brilliant ...... your scrappers look better than my good ones ....... :(