How to Fix a Roller Blind That Rolls Too Fast or Too Slow

The spring mechanism inside a roller blind loses calibration over time.

Too much tension and it snaps up before you’ve let go. Too little and it crawls down or won’t retract at all.

Both are fixable at home with no specialist tools.

What You’ll Need

Tools

• Stepladder or stable chair
• Flat-head screwdriver
• Needle-nose pliers (optional, for stubborn pins)

Materials / Replacement Parts

• No parts required for tension adjustment
• Replacement spring mechanism (if the spring is broken, not just misaligned)
• Replacement roller brackets (if damaged during adjustment)

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How to Fix It: Step-by-Step

Step 1: Work Out Whether It’s Too Fast or Too Slow

Before touching anything, identify which problem you actually have. A blind that shoots up with force has too much spring tension. One that drops slowly, won’t retract, or stops halfway has too little.

• Pull the blind down to the halfway point and let go
• If it rockets to the top: over-tensioned
• If it barely moves or drops back down: under-tensioned
• If the mechanism makes a grinding or clicking noise as it rolls: the spring may be damaged, not just mis-set

Step 2: Remove the Blind from Its Brackets

Take the blind down so you can work on the spring without fighting gravity. Most roller blinds unclip or lift out from their brackets.

1. For side-loading brackets: push the blind towards one bracket to compress the spring end, then drop it out of the opposite bracket
2. For top-loading brackets: lift straight up and out
3. Set the blind flat on a table or floor
4. Note which end has the pin (the round protruding metal pin) and which has the flat end cap

Step 3: Adjust the Spring Tension

This is where the fix happens. The spring lives inside the tube. Adjusting it is done by rolling the fabric off and manually winding the tube.

To reduce tension (blind rolls up too fast):

1. Roll the fabric off the tube by hand, unwinding it completely
2. Hold the fabric flat and let the spring in the tube unwind slightly by itself
3. Re-roll the fabric back onto the tube by hand, keeping tension consistent
4. The more you let the spring unwind before re-rolling, the slower the blind will return

To increase tension (blind rolls too slow or won’t retract):

1. Roll the fabric off the tube by hand
2. Hold the pin end of the tube and wind it forward (in the direction the blind normally rolls up) about three to five full rotations
3. Re-roll the fabric back onto the tube while keeping the spring wound
4. That pre-loaded tension is what makes the blind retract sharply

Step 4: Rehang and Test

Get the blind back in its brackets and test before calling it done. One adjustment rarely gets it exactly right.

1. Rehang the blind and pull it down to the halfway mark
2. Let go and watch the return speed
3. Too fast still: take it down and let the spring unwind a rotation or two more before re-rolling
4. Too slow still: add another three to five rotations of tension to the tube
5. Aim for a smooth, controlled return that stops at the top without bouncing or slamming