Can I fit this MS into the barrel？

[EatPeach]

Hey guys. I'm repairing a Universal 42 movement which‘s mainspring is broken. I did find cousins is selling the mainspring that fit the barrel but the shipping cost to my country is too high.

The information about the MS:

However, I found my local store is selling the mainspring of Rolex 1600 with a very decent price. The size is below:

Can I fit this mainspring inside the universal's barrel？ And this one is slightly thicker and longer. Would it be too powerful for the movement?

Thank you!

[clockboy]

 It might be too long and too strong. 

[Nucejoe]

I am afraid this MS spells trouble. I,d get the right one.

[EatPeach]

34 minutes ago, clockboy said:

 It might be too long and too strong. 

So this is what it looks like now with 260mm mainspring. Will it have enough room for 285mm?

[EatPeach]

Just now, Nucejoe said:

I am afraid this MS spells trouble. I,d get the right one.

The biggest worry is it will be too strong to damage the movement.

[rodabod]

Sorry to disagree with most of the comments here, but:

Height is 0.8 vs 0.9 - possibly problematic in terms of the spring twisting or rubbing the barrel/cap. Negligible loss in strength. 
 

Thickness is 0.103 vs 0.1 - in most likelihood the same. And even if there was 3% greater thickness, it would be negligible and compensate for shorter height. 
 

Length is 285 vs 260 - 10% longer. This will make little difference. Might shorten the running time slightly by consuming more space in the barrel and make negligible difference to strength. 

[EatPeach]

Sorry to disagree with most of the comments here, but:
Height is 0.8 vs 0.9 - possibly problematic in terms of the spring twisting or rubbing the barrel/cap. Negligible loss in strength. 
 
Thickness is 0.103 vs 0.1 - in most likelihood the same. And even if there was 3% greater thickness, it would be negligible and compensate for shorter height. 
 
Length is 285 vs 260 - 10% longer. This will make little difference. Might shorten the running time slightly by consuming more space in the barrel and make negligible difference to strength. 

Thanks for your suggestion. So overall, do you think it worth taking a shot or just go for the original one.

[rodabod]

What is the movement caliber, and what is the difference in cost?

[EatPeach]

What is the movement caliber, and what is the difference in cost?

universal 42
£30 vs £ 6

[rodabod]

Nice movement, but nothing particularly rare or special. If it were me, I’d try the £6 spring - you don’t have much to lose. 

[EatPeach]

Nice movement, but nothing particularly rare or special. If it were me, I’d try the £6 spring - you don’t have much to lose. 

yeah that's what I'm thinking now.