Will the spring fit up into the groove in the frame without putting the other end into the hole? Just a quick check on whether or not the cerakote build up might be affecting the fit at that point. If it will go up in the groove that's great. Not and issue.
The next thing to check would be if the other end of the spring will go down in the hole without interference.
Then check the grooved pin to see if it fits in the frame.
Once you're sure all the parts fit where they should be, then it's time to install the parts together.