Hi The part no's of the suspension and main springs will depend on where they are puchased from

Roy

Mogens, the part number is useless if you don't know the supplier to whom the numbers pertain!

If it helps, you will find that when buying mainsprings from a supplier, the dimensions you will use to select them from stock charts are:
(a), the internal diameter of the mainspring barrel
(b), the working depth of the barrel, which is internal measurement from the bottom of the barrel to the inside face of the barrel cap, you can get away with using a depth gauge using the seat for the cap as a datum!
Allow for working clearance inside the barrel when closed, the springs available will probably determine this, too wide and the cap won't fit, so select the size down where it will!

(c), the 'Force' or thickness of the spring, this is the main dimension you will need because you already have the others if you have the barrel to hand!

Meadows and Passmore usually have a good stock:
**LINK**

It's a bit of a faff going from their homepage because there's no direct link to their mainspring listings (robots), but click 'Buy Online' > Enter M&P Store > The Driving Force + enter 'mainsprings' in the search box > this will take you to their mainspring listings, you'll get an idea then of their sizing conventions and increments of dimensions between sizes, it's the same for all of the suppliers I've used.

John

Russell has a number of progress photos uploaded. Just click on the link under his name on the original post. They demonstrate that clockmaking skill is passed down the generations so perhaps one day the relevant gene will be identified. Thanks for sharing.

Mogens, the sepc's given of 20 x 45 x 45 are:

20 = 0.20mm which is the thickness or 'Force' of the Spring,
45(1) = 45mm = 'Height' of the spring, which is the depth of the barrel with cap fitted and allowance for working clearance,

45(2) = 45mm = Internal diameter of the mainspring barrel!

The spring will be supplied fully coiled and wired, you will need a mainspring winder to release it from the wire so you can clean and lubricate the spring before fitting, and then to wind the spring again prior to fitting to the barrel.

Note that with both Height and Barrel diameter, for purchasing other sized springs, you will need to check which way round M&P specify those dimensions, I've numbered them 1&2 for the purpose of this reply only, they may be the other way round!

Spring 'diameters' are sized on internal barrel sizes, and have no bearing on the actual diameter  of the coiled spring you will be supplied with, it would depend how tightly M&P wound it before wiring it up!
Although it's most likely it would drop straight into a barrel, you wouldn't want to do that without cleaning any preservative and dust off, then lubing it first!

Hope this makes sense,

John

Edited By RJW on 17/12/2012 19:35:24

Hello folks

Thank you very much, I will go ahead in the workshop.

Wish you all a merry christmas.

Mogens

Hello Morgens,

Yes, That is correct.

John.