If you have ever tried to replace a toilet seat, you know the struggle.
You are on your knees, hugging the cold porcelain, trying to reach your hand into that dark, dusty, impossible-to-reach space behind the bowl to unscrew a rusty plastic nut.
It’s called “Bottom Fixing,” and frankly, it belongs in the past.
In 2025, there is a better way. It’s called Top-Fixing (or Blind Fixing).
As a source factory (Fujian Chuangshi Sanitary), we equip our premium seats with this technology standard. Here is why you need it and how it works.
Why “Top-Fixing” Changed the Game
Modern toilets, especially high-end “skirted” designs, have smooth sides that hide the trapway. They look great, but they cover the access holes underneath.
Bottom line: You literally cannot install a traditional seat on them.
Top-Fixing solves this by allowing you to do everything from above. No reaching, no blind fumbling.
How It Works (The “Anchor” Principle)
Instead of a nut that screws on from the bottom, Top-Fixing uses a specialized Expansion Bolt.
Insert: You drop the expansion plug into the hole on the ceramic.
Tighten: As you screw the stainless steel bolt into the plug from the top, the bottom of the plug expands (like a wall anchor).
Lock: This expansion grips the ceramic tightly, creating a rock-solid bond that won’t wiggle.
Step-by-Step Installation Guide
(Based on the Fujian Chuangshi Easy-Install System)
Step 1: Prep the Holes
Remove your old seat and clean the ceramic surface thoroughly. Insert our specialized Expansion Plugs into the hinge holes.
Step 2: Position the Metal Base
Place the stainless steel hinge plates over the plugs. Insert the screws but do not fully tighten yet. You want them just loose enough to slide around.
Step 3: The “Click & Align”
Snap your new seat onto the vertical pins of the hinge plates. Now, adjust the seat until it aligns perfectly with the front and sides of your toilet bowl.[2]
Factory Tip: This alignment step is impossible with old bottom-fix seats!
Step 4: Final Lockdown
Once aligned, click the quick-release button to remove the seat (leaving the hinge plates on the toilet). Now, tighten the screws completely with a screwdriver.
Cover the plates with the decorative metal caps, and snap your seat back on. Done.
Conclusion
Stop making plumbing harder than it needs to be.
With Fujian Chuangshi’s Top-Fixing Metal Hinges, you get a seat that installs in minutes and stays tight for years.
Shop our Top-Fixing Collection and save your knees.