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Rail distance control for modelrailroad scale H0
Designed for H0 scale model railroad
To keep the distance between rails the same before fixing them, use the distance holder. It is made in two parts - the slider and the screw holder. You need additionally a counter sunk bolt and a wing nut, both M5.
May need a little rasping to fit between the rails, depending on the accuracy of your print.
Design was made with FreeCAD - files also attached