As Bogs has pointed out the quill dose drop on these machines ,giving a poor finish when boring and worse if you are doing an intermittent cut ,say cutting a radius on cylinder saddle using a boring head and down feeding the quill.
The cutter will move up as it comes in contact with the work and drop as it leaves
![:bang:](https://madmodder.net/Smileys/default/BangHead.gif)
So the quill needs to be loaded up so that it is always in contact with the quill feed pinion.
Mods done to my RF25 MILL/DRILL ,,,spring attached to collar on quill ,fed up through the head casting and secured to the belt guard .. Sorted .
![](http://www.nam-engineering.com/cm/albums/userpics/10002/normal_P1020762.jpg)
![](http://www.nam-engineering.com/cm/albums/userpics/10002/normal_P1020763.jpg)
Got rid of the two nuts that lock the head , fitted two levers ,,,Replaced the small lever that locks the belt tensioner with a T bar ,,, and fitted lever to motor mount plate to make belt tensioning easier.
![](http://www.nam-engineering.com/cm/albums/userpics/10002/normal_P1020761.jpg)
Rob