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28.25 is what I used, seemed to make the measurements easier, but as long as you put in your distance from top nut to bottom nut you will be fine. The nice thing is if you are off you can put it into the calculator and get out the right distances.
Mine has been good for a few years. If you are worried you could to the two vertical pieces out of thicker stock.
Raspberry Pi Class
What You'll Need & Learn
Tools, Materials, and What You'll Learn
Two Part Molds
Flexible Block Molds
Mold Making & Casting Class
Introduction to Mold Making & Casting
Tools & Supplies
Quick and Easy Piadina Wraps (Italian Street Food)
Somen Noodle Sushi
3 Ingredient Mizithra Chees...
Quail Egg Brunch Bites
Quail Egg Quiche
Retreading Your Lawn Mower Tires