Model Rocket Fin Alignment jig

This guillotine-style fin alignment jig is similar to the design from Macklin Missile Works. It provides convenient and accurate attachment of fins to model rocket body tubes. Three sizes are available (mini, small, and large) to accommodate a wide range of tube diameters and lengths.
*** For personal use only ***
Suggestions for improvement are welcome!

MINI:
The mini jig works great for your typical hobby rockets, especially the short ones. It can handle body tube diameters up to 1-3/4 inches (45mm). The base is about 4" long. It was perfect for my Estes Bullpup 12D. You will need to print two copies of the mini clamp if you have a large enough print bed (300mm x 300mm), otherwise you will need to make your own clamps as described below.
SMALL:
The small jig is a good choice for the majority of hobby rockets. It can handle body tube diameters up to 2-1/4 inches (58mm). The base is about 6" long which means it cannot be used with body tubes shorter than your fin length + 6 inches. T