Great help in the garden fence

When building a garden fence this level would be a great help, because my girlfriend somehow can not properly deal with a normal level and I do not have even the 3rd arm. Both the set of fence posts as well as the slats of the crossbar, so both horizontally and vertically, the device can attach quickly and easily.

Points I must put unfortunately because the rubber for fixing. In the 70 fence posts affixing was always just before the break point. Since the elastic band is mounted on the two sides, there was eventually lost. A suitable replacement could not be found at the hardware store. It would be beneficial have been if even 2 Refills supplied or used instead of rubber for attaching a strap with velcro.