Wolf Recoil Springs For 1928, M1, 1921?
Posted 23 February 2004 - 10:04 AM
Also, has anyone used these Wolfe replacement springs in a M1 Thompson or the Wolfe 21 spring in a M1921?
All of the Wolfe springs seem pretty stiff and seems to me would make the cyclic rate faster. Or am I incorrect and they will do the reverse and make the cyclic rate slower?
Posted 23 February 2004 - 10:45 AM
“TM9-1215 (3/1/42) says the free length should be 10 +.25" for inspection. I understand that another manual (which I don't have) shows a different number (supposedly longer). The guy in the field would have no interest in or use for further specifications, but as we both know, free length is only one of several important parameters. After examining several different springs of known origin (or at least a high probability of known), this is what I have observed: GI springs go 11.25" - 11.50" free length with 69-70 active coils, open ends. Wolff; 11.75", 67 active coils and closed ends, Whittenberger; 11", 72 active coils, closed ends. All are made from .042 wire and have a outside diameter of .385- .392, the Wolff being largest. I have used the military and Wolff with good results. I just received the Whittenberger the other day and will have to examine the effect of the extra coils, but good results have been reported by others. The Wolff seems to be a bit more aggressive than the GI due to the extra length and modern wire (I assume) and care needs be taken when installing it to avoid kinks, but not much more than usual.”
The M1 and ’28 models use the same spring. You will likely see an increase in cyclic rate with the new spring, but not much.
I have measured and used the Wolff ‘21 springs and find them compatible with the Colt springs I have examined.
Posted 23 February 2004 - 05:34 PM
I do like Wolff springs, but why bother?
Posted 23 February 2004 - 06:50 PM
Posted 23 February 2004 - 07:53 PM
Posted 24 February 2004 - 02:39 PM
I been dealing with Sarco for over 25 years. I've had both good and bad experiences with them. Overall I would agree that they do try to please and will make right any errors or unacceptable parts. I bought recoil springs from them that were of varying lenghts and some were rusted. The ones I got from Glen are brand new, less expensive, quick service and they work. I shoot my gun all the time. No problems. Go to Sarco's table at Knob Creek and take a look at some of the stuff they put out, if you can dig through all the crud that is usually on their parts. They have a large inventory but some times their service is lacking and the parts can be subpar. Sooner or later they may be the only place to get TSMG parts until then I will shop around. Just my .02
Posted 24 February 2004 - 03:21 PM
Ordered a bunch of the 28/M1 recoil springs from Sarco today. I've done a bunch of business with them over the years as well and am glad they are there. Can't imagine not having Sarco around. Have always enjoyed their ads in Shotgun News and would love to take a tour of the place (shopping tour).
If I can find out how to order the Whitenberger springs, I would like to get one or two of those as well and compare them all. However, I am most interested in having the Thompson function as it was originally issued and to me the GI springs, in NOS condition, are the way to go.