The J Spring may well have been heated and bent by someone in an attempt to effect the tension.
Replacements might show up on Ebay and such. There's always a chance someone has some parts around.
If they didn't heat it past approx 750F,,it still will most likely have it's spring tension.
Much past that temp and the spring temper is drawn and the part will be too soft to operate as a spring.
They can be rehardened and tempered back to life though.
If you want to experiment a little with the J Spring in it's current condition, you can add a small amt of metal to the notch in the FE extension that is in the bbl now.
That will increase the amt the J Spring has to bend in order to snap into position. That extra 'snap' is usually enough to make the FE tight when placed in position.
One common Field Expedient is to simply lay a lead shot/BB in that notch. Then carefully replace the FE assembly on the gun. The tip of the J-Spring bears against that notch and the
extra space taken up by the lead shot will make the spring bend a bit more.
Once the FE is snapped into place, taking it back off will usually leave the imbedded & mashed piece of shot right there in that notch for you.
I've seen a number of old SxS's with single piece of shot wedged into place to keep the FE tight.
If you don't want to go with the above as a permanent repair (and it certainly is not),,then at least it shows you what you need to do.
You can straighten out the arc in the J Spring. That will increase it's length a bit and tighten it up.
Springs are not that brittle that you can't bend them ' a small amt'.
You can't over do it,,they will fracture at that point. But taking a slight amt of the arc out of it is easily done by placing that section onto a lead block and a couple careful hammer swats to the back side of the spring will bend it enough.
You can extend the tip of the spring a small amt by a simple thin piece of sheet metal folded over the tip. Even brass works ok.
That can be soft soldered into place so it doesn't slip off everytime you remove the FE.
Soft Solder is around 400F and won't effect the spring temper (if it's still there).
The spring was tempered/drawn back at around 700 to 775F.
The lightweight leaf spring that holds the J Spring in place so it doesn't disappear down into the FE can be made from light weight flat spring stock.
It usually doesn't even have to be softened to do the slight bends in it.
Metal packaging banding works well for lightweight springs. Some dumpster diving can get a lifetime supply at Home depot stores and the like.
Hack saw blades can work as well but need softening/draw back or they will usually crack or fracture at the bends.
The hole already in each end of a blade can be used for the screw hole needed on the spring.
Heat to red,,allow to cool.
Cut to length and width with a shears.
Polish the metal lengthwise.
Heat again to bright red and oil quench.
Then draw it back to 'Spring Temper'
Either by eye balling it (the colors change very fast on thin pieces like this.
A lead pot and a themometer is the better/accurate way.
Here's a couple ofpics of the J Spring and the helper spring on a Baker.
This J spring was a replacement that was too long and the lower portion of the arc where the pin hole is was too thick.
It worked on the gun but needed 2 hands and a pry stick to get the FE back off.
Plus the overly thick spring when the FE was on the gun pushed on the wood down in the inlet and popped a piece right off of the FE.
JSpring was reground and thinned so it didn't poke thru the wood. (Checkering was patched up and the pattern redone.)
I bent the arc of the spring as above to get a bit more tension on it since the regrind lightened the tension of the spring.
Hope this all helps in some way.
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