Good notes, here's the original..
Lyn J. Mangiameli
>section from my DVR review:
The locking handles of the banjo and tailstock have long been a weakness of the Teknatool lathes. The manufacturer has made several changes in these handles over time and model, but they remain somewhat uncomfortable and awkward to use. The good news is that relatively cheap modifications can greatly improved this aspect of the DVR. For around twenty dollars, you can outfit your DVR with comfortable, effective, durable handles, greatly easing the day to day use of the lathe.
The banjo is locked using a short metal lever. This 4 inch locking lever is the same as that supplied for the tailstock, and in both cases is over an inch shorter than the one that came on the Nova 3000. This shorter length is necessary on the tailstock in order to clear the tailstock hand wheel, and for that purpose is acceptable. However, for use on the banjo, the lever is both too short and too small in diameter to be truly comfortable. Fortunately, you can improve upon the handle quite easily and cheaply. Reid Tool Supply is a good source for replacement handles (Reid calls them Gear Levers), and looking through the pages of their catalog you will find you can obtain several sorts of handle styles and lengths (something between 4.5 and 6.5 inches will work the best). My favorite solution is to scavenge an original Nova 3K handle, or lacking that, to obtain a basic steel shaft that is threaded on one or both ends (e.g., Reid # GLS-170). Over either of those shafts I use the Ergostyle soft touch push fit handles (Reid # ESP-85). These �push fit� handles are not really push fit for the 10mm metric sized Nova levers, so you must ream them out with a 10 mm drill bit to get them to fit�putting a little hole in the end will also help release the internal air as you push them on. I like these handles so much that I don�t mind going to these extra steps and use them for both the banjo and the tailstock levers. The firm molded rubber of the Ergostyle handles gives you a 7/8 inch diameter by 3.35 inch long gripping surface, rather than the hard 10mm (essentially 3/8 inch) diameter surface of the steel levers. Regardless of the levers you obtain, make sure they have the M10 x 1.5 threading that is necessary to screw them into the Nova mounting holes, and use a good wrap of Teflon tape or some thread locking compound to keep these coarse threads tight against their mating surfaces.
The locking lever for the tool rest is as much an aggravation as that for the banjo. It is not infrequent that a hand grasping the banjo locking lever is squeezed up against the tool rest post locking lever (or vice versa). I�ve found the solution is to use a ratcheting/adjustable handle, not unlike those found on many mini-lathes, but much heavier duty. Again, Reid Tool has the KHX-345 metal handle, which has the necessary M12x1.75, one inch stud. This is one of my favorite modifications to my DVR. This big secure handle gives a good solid grip, and can be adjusted to whatever angle is most conducive to operation or getting the handle out of the way.
Before leaving this area, I want to point out a simple adjustment that can be made to the banjo locking mechanism. Some find, either upon receiving the lathe, or after a period of use, that the banjo does not lock down quite as tightly as might be desired. A simple improvement can almost always be attained by sliding the banjo off the bed, turning it over and tightening the bolt that attaches the locking plate to the locking mechanism. This bolt is countersunk and has a socket for an 8 mm Allen wrench. It will already feel tight, but if you apply force, it will usually tighten about an additional quarter turn. I�ve done this on two Nova 3ks and my current DVR, and in each case it has improved the locking action. While you have the banjo upside run a file along the bottom side of the banjo housing, just enough to smooth over any variations in paint thickness and remove any casting flash�doing so will improve how smoothly your banjo will slide, as well as allow it to lock down more securely. One last thing while you have the banjo off is to lightly oil the slide. This can be done from the top side as well, by removing two plastic caps. Lubricating the locking mechanism is discussed in the DVR manual and is basic maintenance for these lathes. If ever you find the banjo is seeming to become difficult to position freely, it is usually that the slide portion of the locking mechanism is due for a little lubrication.