Mainsprings
 

I just measured the mainspring that came out of my 1921 DWM against a new replacement. The used spring is 9/16"s shorter. Is this a result of 80 years of compression? For those who have replaced mainsprings, is this size difference the norm? Heading back to the range Thursday to see if this replacement made a positive difference. Thanks - Bob

Re: Mainsprings
 

It is normal, I dont remember the exact measurement but the new ones are always longer than the old ones. You need a good mag with a stout spring and good lips (undamaged) to go in concert with the new spring. It really helps?! Ted

Length isn't really the issue Bob and Ted
 

(No wisecracks Hugh and Frank!)unless the spring is too long and will not permit full use of the toggle. The issue is the appropriate amount of spring tension. Depending on the diameter of the spring wire used, and the manufactured diameter for the replacement spring, it could be longer or shorter and still work fine. Use a known good magazine for the testing. If you have more than one Luger and it is possible to switch cannon assemblies from the one that doesn't malfunction to the one that does would tell the tale about whether or not the mainspring is functional.


I would imagine that the only way to know what the appropriate amount of spring tension for maximum compression of the replacement spring is, would be to have access to engineering specifications from DWM or Mauser or one of the other manufacturers on replacement part springs.


How about it Patrick, got any details about original Whermacht specs on mainspring tension over there?


-John

Re: Length isn't really the issue Bob and Ted
 

I guess my statement should have said the "Wollf springs" I install always have been longer than the ones they replace! Ted

OOPs - I left DOK off the comment caveat! (EOM)
 

Yes... and I jumped right in there (EOM)
 

Re: Length isn't really the issue Bob and Ted
 

I understand that it is not the size of the spring but how it is used that counts

And Hugh totally disregarded my request for silence! (EOM)
 

Thank you Frank for holding your tongue when I know you really wanted
 

to make a disparaging remark! I knew you could do it...

Re: Length isn't really the issue Bob and Ted
 

I don�´t think there are any available. I�´ve found that the Wolff calibrated set is a great help to find exactly the right strengh (especially on the new Baby Luger).