A few things come to mind.
One of mine had a similar problem with the safety lever. IIRC, a slightly larger diameter pin that holds it in fixed it.
Did you remove the lever from the frame? Others have said that crud around the lever's shaft affects its operation.
If all is otherwise OK, it's possible to remove the lever and carefully (the part is somewhat hardened, I believe.) bend/adjust the end of the lever so it presses against the frame more closely and engages the detentes more securely.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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