I am going to absolutely love this positioning aid. I have about 50-60 drawer fronts and face frames that need to be edge sanded. I hooked it up to the ETSC 125 and also the DTSC 400 last night and sanded a couple of drawer front edges. Using the same grit (240) the DTSC took only half of the time, that the ETSC needed, to remove the small saw blade marks and that all makes sense.
![Smile [smile]](https://www.festoolownersgroup.com/Smileys/default/smile.gif)
Both of these sanders fit very snugly into the unit but it's this tab on each side that indexes and locks the sander in to the aid. The tabs prevent any movement of the sander what so ever.

When the tabs on the aid are fully engaged with the sander this is what the ETSC looks like.

This is what the DTSC looks like.

The Pro 5

The ETS 125 EQ does not fit because there is no receptacle for the tab.

The same thing goes for the DTS 400 EQ.

It's interesting to note that the Pro 5 was designed over 4 years ago and at the time they incorporated 2 recesses in the body to locate & hold the edge protector, these recesses are what the tabs on the positioning aid recess into.