Should I fix this shellac?

[GPrideaux]

One of the pallet stones on today's movement (a Zim 2602.1) has assymetrical shellac.

It looks to me that half the shellac has come away, although the stone appears to still be secure with the shellac that remains. I'm thinking I should probably repair this before I proceed. Is it likely to be successful if I add a little shellac and warm it until it melts? Is the existing shellac likely to melt at the same time and reflow with the new? Or should I remove all the existing shellac before applying new? (This will be only my second time applying shellac to a pallet.)

[oldhippy]

From the photo it looks as if the pivot has broken. If you add more shellac what is already there will melt. To be fair it all looks a mess.  

[GPrideaux]

The photo is looking almost straight down the pivot which is why it looks broken. I think the pivots are actually fine.

These are disassembly pics, prior to cleaning. (I'll use cleaner Rodico after cleaning!)

[nevenbekriev]

The pivots are OK, but the pallets stones (at least entrance one) seems chipped. About the shellac - just heating to melt it will be enough,  just clean and degrease before.

[GPrideaux]

I think there is a chip from the bottom edge of the exit stone but the lock and impulse faces are intact where they interface with the escape wheel. I think it's still usable.

[nevenbekriev]

Yes, it the chip is not in the trace of the teeth, then the stone is usable. More, You can move the stone up/down in order to use the clean  not chipped part of the stone.