Guide ruler for mortar coatings applied on e.g. aluminum, PVC, wood, has spring, which connects between fixed short section and slidable long section, which biases long section into sliding motion relative to fixed section

摘要

A guide ruler has a fixed short section and a slidable long section connected together at their matching inner profiles. A biasing spring is connected between both sections. A screw keeps the long section in place relative to the short section. When the screw is removed, the spring biases the long section into sliding movement relative to the fixed section.