When measuring a mainspring for a 6119 I know that the thickness is 0.12, the height is 1.05 and the length is 440mm. An automatic bridle is needed and the length is supposedly meant to fill two thirds of the barrel for the most efficiency. Can someone help to explain why this barrel coverage is best, what the difference would be if reducing the height and/length in terms of how they will affect the thickness?
I bought a 360mm mainspring of the correct height and thickness, but I have heard that a 1mm height ms would be OK, and also that the thickness could be thicker or thinner depending on the length.
Could someone explain their thought process and understanding when replacing the ms if an exact replacement isn't possible please?
I noticed that the correct length on Cousins is a: out of stock, and b: over twice as expensive (£17) compared to the 360mm length (£7). What's the room for maneuver here and despite NOS mainsprings being available (#0401615) I tend to think that due to age they may be a little less sturdy than a replacement? Also, with new mainsprings I've heard the teflon coating is actually the worst type of dry lubricant, and that there is a benefit to removing it therefore and replacing with your lube of choice? I doubt I would do that, but how do you remove the coating (just simply wiping with watchmaker's paper?) and is that the done thing for anyone here?
I bought a 360mm mainspring of the correct height and thickness, but I have heard that a 1mm height ms would be OK, and also that the thickness could be thicker or thinner depending on the length.
Could someone explain their thought process and understanding when replacing the ms if an exact replacement isn't possible please?
I noticed that the correct length on Cousins is a: out of stock, and b: over twice as expensive (£17) compared to the 360mm length (£7). What's the room for maneuver here and despite NOS mainsprings being available (#0401615) I tend to think that due to age they may be a little less sturdy than a replacement? Also, with new mainsprings I've heard the teflon coating is actually the worst type of dry lubricant, and that there is a benefit to removing it therefore and replacing with your lube of choice? I doubt I would do that, but how do you remove the coating (just simply wiping with watchmaker's paper?) and is that the done thing for anyone here?
