Double Bass C Extension

[bassics1975]

I just got back from picking up my bass at the shop where it was just fitted with a new C extension and Rob's capos. I must say, these new capos are really great!

My question relates to the geometry of creating the extension and fitting it to the bass. The C-string does not run parallel to the extension itself on my bass but runs on an angle and as a result, each capo engages the string differently. I was just wondering if this is something to address or is it a common issue. Glad to hear what you have to say.

 

[Schoolhouse]

Installing an extension is a job that frequently involves compromise. Ideally the extension follows the line of the fingerboard in a direct line to the center of the scroll. Unfortunately, this rarely happens. Most luthiers first make a rough extension out of some cheap material in order to see what problems might occur. Factors might include width of the head, taper of the scroll, thickness of the fingerboard, space available for the E flat capo, and overall esthetics. The nut at the top must provide a straight and equal spacing for the low string at the normal nut. Sometimes this means that the extension does not have parallel sides or the wheel at the top is not centered. If the arms are of uneven lengths they can be adjusted to give an even appearance.
I do install the Bass Capos and find them an excellent product. Making a good extension is a difficult task if using capos or fabricating stops oneself. Adding artistry to it is even harder.

 

[robobass]

Thanks Guys! I aim to please.

Yes, for the reasons Tom cited it's quite common that the string will not be exactly straight and centered over the extension board.

As far as where the fingers close on the string, there can be a fair amount of variation between stops without affecting performance. It's mainly a visual issue, but if uneven finger length is a problem the fingers can be shortened or longer arms ordered. Contact me for details on how to get this done. I even provide custom length arms per request at no extra charge.

An existing finger cannot be made longer, however, so hold off on installing a Capo if you are fairly sure it will be too short (I can't resell a returned arm once there is a string depression in the leather). Just contact me and I'll get you the proper length arm!

Thanks again to all Bass Capo users!