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Here is the tutorial.
Step 1
Top plane>>Sketch.
Step 2
Draw this sketch.
Step 3
Extrude it at mid-plane by 94mm.
Step 4
Top plane>>sketch.
Step 5
Use line tool and make this sketch. These lines are tangent.
Step 6
Mid-Plane by 20mm.
Step 7
Fillet.
Step 8
Select these edges at 5mm.
Step 9
Again fillet and select this edge.
Step 10
We have the crank arm.