Abstract: The invention presented herein allows efficient modification of endpins for musical instruments such as cello or bass that use cavities in one or more components that accommodate filler material. The filler materials are composed of materials that affect the acoustic outcomes. The user can modify the endpin acoustic outcomes relatively quickly by changing the filler composition until a desired acoustic outcome is achieved. This allows various acoustic outcomes using the same shape, materials, and construction for the endpin components. Several embodiments are illustrated for endpins, pedestals, stringed instrument sound posts, interior blocks, bass bars, speaker legs and the like.

Abstract: An end pin for a stringed musical instrument such as a cello, bass or the like having an end pin receptacle at the base end thereof. A first or conical member is slidably mounted on an elongated rod and has a tapered upper end portion which is inserted into the end pin block or receptacle at the base of the instrument. A second or clamping member is threadably secured to the lower end of the first member and tightened thereon which causes a segmented collet portion on the first member to be moved into engagement with the rod to positively maintain the rod in selected longitudinal positions with respect to the instrument.