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Part 2
Step 1
open a sketch on the front plane
Step 2
draw shown lines
Step 3
add shown lines
Step 4
continue your sketch like this
Step 5
add a circle. please attention shown places. select circle type first. then click on shown points. then enter the radius.
Step 6
use trim command
Step 7
add a spline
Step 8
hold on shown point and drag it. enter the shown volues
Step 9
add the last lines
Step 10
use trim command,
Step 11
your sketch must be like shown. please check it
next: http://grabcad.com/questions/tutorial-how-to-model-a-propelling-pencil-6