Device (1, 100, 200, 300, 400) for supporting an endoscopic tool (6, 62), comprising: attachment means for attaching the device to an endoscope (9, 90), a first guide tube configured for accepting the endoscopic tool, the first guide tube having a distal open end, and first and second projecting members (31, 310, 311, 32, 320) extending distally of the attachment means and which are spaced apart when the device is attached to the endoscope to define a working space between the first and second projecting members, wherein the attachment means comprise first (21, 21') and second (22, 22') clamping members and at least one cable (23, 24) linking the clamping members, wherein the cable is remotely actuatable for moving the clamping members relative to each other to adjust a spacing between the clamping members, and wherein the cable can be locked for holding the clamping members in a clamping position when the endoscope is inserted in the spacing between the clamping members, to secure the clamping members to the endoscope, wherein the first projecting member (31, 310, 311) is attached to the first clamping member (21, 21') such that it has a fixed or at least one fixable position relative to the first clamping member, and the second projecting member (32, 320) is attached to the second clamping member (22, 22'), and wherein the first guide tube is slidable relative to the first clamping member, characterized in that the distal end of the first guide tube is pivotally attached to a distal end of the first projecting member (31, 310, 311) so as to enable the distal end of the first guide tube to be pivoted to an orientation transverse to the first projecting member, and in that the distal end of the first guide tube is in communication with the working space when in the transverse orientation. attachment means for attaching the device to an endoscope (9, 90), a first guide tube configured for accepting the endoscopic tool, the first guide tube having a distal open end, and first and second projecting members (31, 310, 311, 32, 320) extending distally of the attachment means and which are spaced apart when the device is attached to the endoscope to define a working space between the first and second projecting members, wherein the attachment means comprise first (21, 21') and second (22, 22') clamping members and at least one cable (23, 24) linking the clamping members, wherein the cable is remotely actuatable for moving the clamping members relative to each other to adjust a spacing between the clamping members, and wherein the cable can be locked for holding the clamping members in a clamping position when the endoscope is inserted in the spacing between the clamping members, to secure the clamping members to the endoscope, wherein the first projecting member (31, 310, 311) is attached to the first clamping member (21, 21') such that it has a fixed or at least one fixable position relative to the first clamping member, and the second projecting member (32, 320) is attached to the second clamping member (22, 22'), and wherein the first guide tube is slidable relative to the first clamping member, characterized in that the distal end of the first guide tube is pivotally attached to a distal end of the first projecting member (31, 310, 311) so as to enable the distal end of the first guide tube to be pivoted to an orientation transverse to the first projecting member, and in that the distal end of the first guide tube is in communication with the working space when in the transverse orientation.