Review on YARKOR Proportional Pantograph Measurements Proportions by Doris Tran

It is easy to use. However, it was three seconds before he realized he needed an improvement. First, and most obviously, the relationship is untagged. Second, you need a lock. The hinge is so loose that a simple deviation from the original measurement can alter the device. This makes it practically unusable. But if you're careful, it's about normal. Maybe the nuts and bolts manipulated by the jury work. Third, the location of the holes seems odd. Comparing ratios with a ruler doesn't seem to be integer ratios like 2:1, 3:1, 3:2, etc. This could be related to note 2 above. Fourth, there are no instructions. Just a few suggestions can help solve these problems.