you got a very good advice by Chris Radek already, confirmed by John, too:
add a light to medium weight washer opposite of the "heavy spot".
That will solve both issues with one measure - put the balance to equilibrium and slow the rate just enough.
i will answer with some data as a change.
"Alloy" is often used but is a wishy-washy term. Modern mainsprings are available from Inox (lower cost) or from Nivaflex (higher cost, about 3x Inox).
Ok, I had to look it up:
Torque of the barrel M ~ E x I
E= E or Young's modulus
I= moment of...
If you want to know the right amount of adjusting the pendulum bob without try and error, no measuring equipment is needed. It can be exactly calculated (if you can :-)).
Easyer is using the small free windows programm "Pendulum". Look here or download the latest version here.
lower amplitude has the advantage that a certain amplitude variation will have less impact on the rate (limited by the point where movement can be detected at all and its accuracy).
And - the lower the amplitude, the shorter the portion of free swing of the pendulum, unaffected by the...
Thank you for this variant of blueing!
I suppose, the color appears after removing from the molten salt. Doesn't the salt stick to parts and cause stains?
Is the pot removable or fixed to the device?
Good hint, Karl! I will try that method next time (if not forgotten till then).
For bending I use a pliers with brass tips similar to this one:
Bending in the caliper is questionable in my eyes, as it is stress for the rivet.
Finally, none of my calipers are used any more: now I test in the...