If the spring is properly seated (the short part of the "L" is fully inserted into the little hole in the frame, it's probable that it's pushing the bolt off center as you try and insert it.
As you push the locking bolt into position, try pushing down on the locking bolt body exposed in the middle of the frame. Once it's aligned it should pop into place.
If this doesn't work, the spring may need to be formed to relieve a little of the pressure. That is why the little curve is shaved out of the middle of the spring.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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