Test tube holder modular

This is my take on a modular test tube holder. (Reagenzglashalter) Overall size of one module is 157x44x160 mm (LxWxH) The diameters of the supported testtubes are 6 10 12 14 16 18 20 24 30 (in mm). The basplate is extendible in both directions.The security clips are swapable if you break them.Yes in the beginning it's very tight while connecting but it is possible i tried. It has to be alinged and gets a bit looser over time, but it has to be this tight, so it won't fall apart wenn you use more modules. You can choose the heigt of the guiding plates regarding the length of your test tube. Assemble help:the "srews have a top and a bottom. and the bottom needs to be faced to the plate it is holding in place. So eiter the baseplate or the guiding plates. Insert the screws into the right place and twist them only 90° degrees to lock them. if you have problems assembling write me and i will provide more detailed instructions. if you want sizes added hit me up and i will make th