I'm having trouble sending a pattern up one edge and down another,

In the attached part, the sketch under "Dove Tails" needs to go up 12 times, spaced 100mm and down 11 times, spaced 100mm

so that when the part is rolled forward, two of them opposite each other in an assembly will make "one" and the holes line up..

for me the pattern will go up, but when I go down all hell breaks loose,

is there a better way to do this, so the pattern propagates from the middle

SW2010, sp2.1