If you fully took the gun down, then your issue could be your Cocking bellcrank pin is not fully installed. If even the slightest bit of the pin is sticking out into the mainspring bore, it will prevent the spring from sliding into the bore.
This is really the only possible thing that can prevent the spring from installing.
I got your email by the way about the broken plunger. I need to check inventory on that and get back to you.
There is no reason that the spring should have to be “twisted” in. Again, I bet that pin is holding it up. It may be in there now by twisting it in, but it will not function properly as the obstruction is still in the way. I have taken apart and put back together hundreds of Parkers and have never had an issue re-installing a mainspring, except for in the scenario of a crank pin not being seated all the way.
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B. Dudley
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