A releasable clamp for holding an article or parts thereof, for example a device or a tool, the clamp comprising: a set of jaws, including a first jaw and a second jaw , arrangeable to hold the article therebetween; a set of spacers, including a first spacer , arrangeable to space apart respective jaws of the set of jaws; and a set of retaining members, including a first retaining member , arrangeable to space together respective jaws of the set of jaws; wherein respective jaws of the set of jaws comprise a first region for contacting the article, an optional second region defining a portion of a first part of a coupling member, a third region for contacting a respective spacer of the set of spacers and a fourth region for contacting a respective retaining member of the set of retaining members; wherein the clamp is configurable in: a first configuration, wherein the first jaw and the second jaw are mutually unjoined; and a second configuration, wherein the first spacer is arranged to space apart the first jaw and the second jaw and wherein the first retaining member is arranged to apply a net compressive force on the first spacer via the first jaw and the second jaw , whereby the first jaw and the second jaw are conjoined and thereby hold the article therebetween; and characterised in that the first retaining member comprises a set of cylindrical bore regions, including a first bore region and a second bore region, for contacting correspondingly shaped fourth regions of the respective jaws. a set of jaws, including a first jaw and a second jaw , arrangeable to hold the article therebetween; a set of spacers, including a first spacer , arrangeable to space apart respective jaws of the set of jaws; and a set of retaining members, including a first retaining member , arrangeable to space together respective jaws of the set of jaws; wherein respective jaws of the set of jaws comprise a first region for contacting the article, an optional second region defining a portion of a first part of a coupling member, a third region for contacting a respective spacer of the set of spacers and a fourth region for contacting a respective retaining member of the set of retaining members; wherein the clamp is configurable in: a first configuration, wherein the first jaw and the second jaw are mutually unjoined; and a second configuration, wherein the first spacer is arranged to space apart the first jaw and the second jaw and wherein the first retaining member is arranged to apply a net compressive force on the first spacer via the first jaw and the second jaw , whereby the first jaw and the second jaw are conjoined and thereby hold the article therebetween; and characterised in that the first retaining member comprises a set of cylindrical bore regions, including a first bore region and a second bore region, for contacting correspondingly shaped fourth regions of the respective jaws. a first configuration, wherein the first jaw and the second jaw are mutually unjoined; and a second configuration, wherein the first spacer is arranged to space apart the first jaw and the second jaw and wherein the first retaining member is arranged to apply a net compressive force on the first spacer via the first jaw and the second jaw , whereby the first jaw and the second jaw are conjoined and thereby hold the article therebetween; and characterised in that the first retaining member comprises a set of cylindrical bore regions, including a first bore region and a second bore region, for contacting correspondingly shaped fourth regions of the respective jaws. <EOS>