Reusing mainsprings in an automatic and slipping

[JohnL]

Hi all,

Might a posit a theory and people can chime in and tell me if I'm barking up the wrong sycamore:

If a mainspring is a bit coned and returned to its barrel for reuse, is it less likely to slip when the spring gets to fully wound? 

For a bit of background: Slava 2427, barrel walls greased with 8217, six dots evenly spaced around each of the barrel walls, then smeared/ spread along the wall before popping the springs in. 

[AndyGSi]

By coned do you mean it sits proud of the barrel before you fit the lid?

[rehajm]

1 hour ago, JohnL said:

six dots evenly spaced around each of the barrel walls

…to clarify, you placed it here, yes?

[JohnL]

Hi Andy, 

Yes, the arbor and a few coils would be a bit higher than the rest of the spring. 

I'm wondering if an alternative possibility is that there is a slight kink close to the end of the spring where the spring overlaps the end of the bridle just before the joint at the end - where the bridle and the end of the spring are joined. This was a bear to wind in/ feed in when winding the spring to put in the barrel. That was on both springs. If it was tough turn against the wall of the washer when winding to go into the barrel, it's probably going to be the same in the barrel, no?

I should probably say, the kink was in both springs, one more than the other, before I got my grubby little paws on them.

@rehajm, I placed it at six spots rather than five, but yes, around the wall evenly spaced as in your diagram. 

Edited 1 hour ago by JohnL
clarity

[AndyGSi]

You may get some extra friction on the barrel lid so may not slip as easy but I wouldn't think it's a problem.

My suggestion would be to finish the assembly and see how it runs.