A pin securing assembly 10 for use in a pivot joint, the assembly 10 comprising: a pin mounting piece 12 comprising: a pair of spaced apart, parallel lugs 20 having corresponding registering holes 22; and a tool mounting piece 24 having a circular cylindrical bore and being arranged coaxially between the lugs 20 such that the bore is in register with the holes 22; a mounting pin 100 comprising: an elongate body portion 102 positioned in the holes 22 and the bore of the pin mounting piece 12, the body portion 102 having opposed ends; and a protruding portion 104 which protrudes from an end of the body portion 102 and on which is provided oppositely disposed, first and second mounting formations, the mounting formations having corresponding first ends 32 and corresponding second ends 33, the mounting formations being inclined relative to one another such that a first distance X between the first ends 32 is greater than a second distance Y between the second ends 33 of the respective mounting formations, wherein the protruding portion 104 protrudes from the pin mounting piece 12; a securing member 14 which defines a seat 16 having oppositely disposed, inwardly facing, first and second faces 40, 42 which are complementary to and seat against the first and second mounting formations, respectively; and locking means 18 locking the securing member 14 releasably to the pin mounting piece 12 such that substantial angular and axial displacement of the pin 100 relative to the mounting piece 12 is prevented; wherein the body portion 102 located within the tool mounting piece 24 forms a journal which permits rotation of the tool mounting piece 24 about the pin 100. a pin mounting piece 12 comprising: a pair of spaced apart, parallel lugs 20 having corresponding registering holes 22; and a tool mounting piece 24 having a circular cylindrical bore and being arranged coaxially between the lugs 20 such that the bore is in register with the holes 22; a pair of spaced apart, parallel lugs 20 having corresponding registering holes 22; and a tool mounting piece 24 having a circular cylindrical bore and being arranged coaxially between the lugs 20 such that the bore is in register with the holes 22; a mounting pin 100 comprising: an elongate body portion 102 positioned in the holes 22 and the bore of the pin mounting piece 12, the body portion 102 having opposed ends; and a protruding portion 104 which protrudes from an end of the body portion 102 and on which is provided oppositely disposed, first and second mounting formations, the mounting formations having corresponding first ends 32 and corresponding second ends 33, the mounting formations being inclined relative to one another such that a first distance X between the first ends 32 is greater than a second distance Y between the second ends 33 of the respective mounting formations, wherein the protruding portion 104 protrudes from the pin mounting piece 12; an elongate body portion 102 positioned in the holes 22 and the bore of the pin mounting piece 12, the body portion 102 having opposed ends; and a protruding portion 104 which protrudes from an end of the body portion 102 and on which is provided oppositely disposed, first and second mounting formations, the mounting formations having corresponding first ends 32 and corresponding second ends 33, the mounting formations being inclined relative to one another such that a first distance X between the first ends 32 is greater than a second distance Y between the second ends 33 of the respective mounting formations, wherein the protruding portion 104 protrudes from the pin mounting piece 12; a securing member 14 which defines a seat 16 having oppositely disposed, inwardly facing, first and second faces 40, 42 which are complementary to and seat against the first and second mounting formations, respectively; and locking means 18 locking the securing member 14 releasably to the pin mounting piece 12 such that substantial angular and axial displacement of the pin 100 relative to the mounting piece 12 is prevented; wherein the body portion 102 located within the tool mounting piece 24 forms a journal which permits rotation of the tool mounting piece 24 about the pin 100.