When I got my 1100, I also bought the modular tapping head kit (#31807). I am happy with its performance, but sometimes it would be nice to have 2 taps set up (or even 3 possibly), and now I realize that the ER16/20 tapping heads (#32020/#32021) would have been more practical than the modular kit. Has anyone used the ER16/20 tapping heads, and how do they perform?