so , what i am going to show you here , is this ~

it is actually really easy .

step 1 . make a new block ( for a beginner i reccommend a square , any size will fit ) .

step 2 . just drag it a little taller . ( step 1 image on the right )

step 3 . select the brush , go to curve - > cylinder . you should have the brush you did in step 1 & 2 go cylinder , do not be bother when it is empty from inside or you see through the insides of that brush , that is normal behavior .

step 4 . rotate is y - axis way , so it goes horizontally .

step 5 . now it is all about how you set your vertices to . press v or pick the option above toolbar . make sure you move them in a square-like position , because if not , it wont come up symmetrical after all . move the vertices like above image . make them go under the angle you wish , i picked 90 degrees angle .

video tutorial of it ~

tutorial done from 2 : 21 pm to 3 : 41 pm , 1 hour and 20 minutes .

download the content of this tutorial ~ *.map file i made + screenshots you see above