Have a fingered C-Extension?   Considering getting one?

Anzellotti Bass Capos — Installation

The ultimate solution for C-Extension chromatic latches or gates!

Anzellotti Bass Capos


For a proper fit, the side of the extension should have a flat area in the mounting position at least 33mm long by 12mm high. Things can be tight in the Eb position, but it is OK to grind a bit of height from the bottom to make it fit.

Once the proper position for the bracket is determined, drill pilot holes with the supplied 3.3mm bit at the midpoint of the slots, about 24mm apart. The default supplied screws are gold-plated #6 truss-head self-tapping stainless steel. Use only a fresh, high quality, #2 Phillips driver, and pre-form the threads with the included un-plated screw.

The standard Capo and E-Stop arms fit extensions that measure up to 3/4" (19mm) from the mounting surface to the string center. If you have an unusually wide extension, let me know, and I can ship longer fingers. If an unusually narrow one, then ask me about stand-off spacers.

Brass screws are now available for the purists out there! Slotted or Phillips. You have to tap an 8-32 machine thread though. I have the tap and pilot drill if you need it.

Wood Spacers

When working with a narrow extension, or if more standoff is desired for any reason, you can get pre-cut spacers in various thicknesses.


The E-stop has a 13mmx3.5mm tang which sits at the end of the fingerboard under the nut. The remaining nut must of course be notched to fit over it. The tang is also available without the slot, which some installers prefer.

I recommend placement where the center of the arm-shaft hole is 21mm away from the center of the E-string. The final working distance will vary with the installation, and the workable range is large. If your pegbox or extension is unusually wide and you think this distance will be 25mm or more, be sure to ask for a long finger.

The rotational resistance for the Capo is "set at the factory" if you will. For the E-Stop it can be adjusted with a set screw using a supplied hex key.

Not all installers do this, but as shown, the E-Stop can be used as a mounting point for the extension body.

Since the E-Stop bracket has no U-channels like the Capo, it is less easily adjusted. Rough adjustments can be made by threading in or out a turn, but the height change will be in 1mm increments. Fine adjustments can be made by sliding the bracket in or out slightly. Sorry. This does mean taking the bass out of tension.

One other note: Some installers have informed me that operation is better if the finger is set to close a few degrees less than perpendicular to the string – pointing slightly up.

Also, a few customers have chosen to use my mounts, but make their own wooden fingers. For this I can ship yokes or E-Stop plates with lengths of plain threaded stud instead of finished arms.


  • Uninstalled units can be returned for full refund within six months.
  • Installed units can be returned within 3 months if found unsatisfactory for any reason.
  • In the case of any failure that is agreed to be the result of a manufacturing defect, parts will be repaired replaced at no charge within 10 years of purchase.