You can DIY spiral binding with a few basics. Here’s a simple approach:

1. Pick a pitch: Plastic coils commonly use a 4:1 pitch; twin-loop wires often use 3:1. Match your coil to the hole pattern.
2. Choose a diameter: Base it on sheet count and covers. Capacity guidelines can help.
3. Punch holes: Use a compatible hole puncher or pre-punched paper/covers.
4. Insert the coil: Twist the coil through the holes; an inserter can speed this up, but manual twisting works.
5. Crimp/secure ends: Trim and carefully crimp coil ends to prevent unwinding.

It’s a good idea to match coil length to your paper size (letter or A4). These steps can help, and results may vary based on tools and materials.

Capacity ratings refer to sheets, not pages. If your 100 pages are printed front and back, that’s roughly 50 sheets. As a general guide:

• 8 mm coils: around 40 sheets
• 9.5 mm coils: around 75 sheets
• 12 mm coils: around 85 sheets
• 14 mm coils: around 110 sheets
• 16 mm coils: around 140 sheets
• 20 mm coils: around 170 sheets

Choose a slightly larger diameter if you’re adding thick covers, tabs, or heavier paper. Coil capacities can vary by material and pitch, so checking each product’s sheet capacity can help you land on the best fit.

Both are popular for spiral binding, but they behave differently.

• Plastic coils: Flexible, resilient against bending, and great for lay-flat and 360° page turns. They’re available in various colors and diameters.
• Wire (twin-loop): Offers a crisp, professional look and stable page alignment. Wire can be more rigid and may bend if pressed.
• Pitch patterns: Plastic coils often use 4:1, while many wire spines use 3:1. Matching the hole pattern is essential.

Consider the environment (backpacks vs. desktop), desired look, and capacity. Reviewing product specs for pitch, diameter, and sheet capacity can help you choose confidently.

Match three things: paper size, pitch, and hole count/length.

• Paper size: Letter is 8.5" x 11"; A4 is slightly taller. Select coils that match the binding edge length (e.g., 11–12 inches depending on your setup).
• Pitch: Many plastic coils are 4:1; wire options may be 3:1. Your punched pattern must match.
• Hole count/sets: Some kits specify 30-hole sets for A4/A5 or list “48 loops” for certain lengths. Align these with your punch pattern and paper size.

Verify capacity and cover thickness, and choose a diameter that accommodates your sheets plus extras like tabs or pockets.

Minor bends can often be adjusted; major damage may require replacement.

• For small bends: Gently reshape the coil with your fingers; a small pair of pliers can help tidy the curve.
• If pages snag: Re-thread any misaligned sheets by slowly turning the coil through the holes.
• For significant damage: Uncrimp or trim the coil ends, twist the damaged coil out, and replace with a matching pitch and diameter.

Work slowly to avoid tearing holes or covers. Using a replacement coil that matches your hole pattern can help restore smooth page turns.