This tool has been very useful while taking apart my NEQ6. I'm happy I decided to buy it.
Is it necessary? Perhaps not, but it makes things way easier, especially with this mod that on the EQ6 mounts it's not the more straightforward.
It gives you the peace of mind of not having to improvise your tool, while making crucial adjustments to the worm gear.
The price perhaps is a bit high for what it is, but I can understand that it's not produced in millions of units and that probably keep the price high.

I bought this tool as I was replacing the bearings on my EQ6 Mount. It is for a specific purpose, in that it removes the end caps from the worm shaft plate and also fits the slotted nut to adjust the play within the worm shaft. My life was made so much easier by using this tool, and so much quicker that trying to make do and mend with other inferior options.