About two months ago I bought a keystone spring on a round body follower rod from a retired US Marine officer. These two parts have been together for a long time maybe even since late 1940 or early 1941. Nice condition, both with nice original color and I did not attempt to separate these parts. I checked the keystone spring and counted the coils a few times to get an accurate count and came up with the following: total length 19 1/8 inches long and 289 coils.
I have been tracking keystone springs for years and the average spring when issued or new was 18 3/4 inches long and with 280 coils
You can find stretched keystones at 19 inches or a little longer but still with around 280-283 coils
The only other keystone that I found that was like mine, belonged to George Apgar, it is also 19 3/16 inches long and with 289 coils.
I have found keystones with anywhere from 275 coils to 283 coils with total lengths of 18 1/16 inch to 19 inches. Now both serial numbered 167583 and 189209 have standard length keystone springs and round body follower rods
Were these springs with the additional coils, manufactured for use only on the round body follower rod ?
I have been tracking keystone springs for years and the average spring when issued or new was 18 3/4 inches long and with 280 coils
You can find stretched keystones at 19 inches or a little longer but still with around 280-283 coils
The only other keystone that I found that was like mine, belonged to George Apgar, it is also 19 3/16 inches long and with 289 coils.
I have found keystones with anywhere from 275 coils to 283 coils with total lengths of 18 1/16 inch to 19 inches. Now both serial numbered 167583 and 189209 have standard length keystone springs and round body follower rods
Were these springs with the additional coils, manufactured for use only on the round body follower rod ?
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