What is RSI?

If using a swivel in hand doesnt the repetetive movement just change to wrist?

In this case all movements are a natural ones.
Not forceful, or awkward hand movements.

Any repetitve movement has negtive impact, wear, over time.

How many of these are used in window cleaning?

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Also enables you to hold or use in any way to suit the way you naturally hold the handle while using.

This means you change way you work without constantly doing same repetitive movements.

Many people asking me how I know this

Had my hand caught at wrist in brick machine injured the wrist which needed to have micro surgery on the tendons.
Which left me very senative to movement while using squeegee.
This allowed me to feel right away there problems with way gripping wise.
And actually find out how it was caused as explained in the video.

So most people will start feeling the RSI over a day, weeks, months or even years.
But really don’t know what actually caused it.

Know not everyone will understand as this can happen over time.

When using squeegee you use your little and ring finger the most.
Even though they are the weakest.
This is due to the handle shape on the 2inch/50mm bottom end of the handle are round/ circular. (Most squeegee handles)
Found if you can put some sort of flat side like what is in this video to the squeegee you have now .
That it will stop or at least relieve Respective Stress/ Strain Injury.

I think you are making things worse on RSI using swivel tools, especially wagtail. It’s trash, imo, and you are overcompensating to control the swivel.

Get back to fixed squeegees, and swivel on t bars.

Yep agree the Wagtail had the right concept.
However the actual swivel angle of handle to the swivel and the grip needs attention.
In relation to the handle grip you can do this with just about any handle.
Will do a video show the easy fix anyone can do.

HERE ARE ALL THE MODIFCATIONS WE HAVE DONE SO FAR TO SOLVE THESE ISSUES.
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Here found this might Something to think about.

Cubital Tunnel Syndrome Ulnar Nerve Entrapment - Everything You Need To Know - Dr. Nabil Ebraheim

The Ulnar Nerve Review - Everything You Need To Know

Believe this May be the Problem the Ulnar Nerve attached to Ring and Little Finger.