A fastener assembly comprising: a threaded member comprising a threaded body portion extending along an axis and a head portion ; a first lock member including a plurality of ratchet teeth and defining an aperture extending therethrough, the aperture sized to receive said threaded body portion, wherein the ratchet teeth extend from the first lock member in a direction parallel to the axis; and a second lock member comprising: a base portion ; and at least one spring finger extending axially from said base portion, said at least one spring finger having a proximal end joined to said base portion and a free end opposite said proximal end, wherein said second lock member has a lock position in which said free end of said at least one spring finger is configured to engage said plurality of ratchet teeth and an unlock position in which said free end of said at least one spring finger is spaced from said plurality of ratchet teeth, wherein said at least one spring finger is displaceable radially inward relative to the axis of said threaded body portion to switch said second lock member from the lock position to the unlock position and disengage said at least one spring finger from said plurality of ratchet teeth, characterized in that said head portion of said threaded member is configured to receive said second lock member and includes a flange configured to engage said base portion of said second lock member. a threaded member comprising a threaded body portion extending along an axis and a head portion ; a first lock member including a plurality of ratchet teeth and defining an aperture extending therethrough, the aperture sized to receive said threaded body portion, wherein the ratchet teeth extend from the first lock member in a direction parallel to the axis; and a second lock member comprising: a base portion ; and at least one spring finger extending axially from said base portion, said at least one spring finger having a proximal end joined to said base portion and a free end opposite said proximal end, wherein said second lock member has a lock position in which said free end of said at least one spring finger is configured to engage said plurality of ratchet teeth and an unlock position in which said free end of said at least one spring finger is spaced from said plurality of ratchet teeth, wherein said at least one spring finger is displaceable radially inward relative to the axis of said threaded body portion to switch said second lock member from the lock position to the unlock position and disengage said at least one spring finger from said plurality of ratchet teeth, a base portion ; and at least one spring finger extending axially from said base portion, said at least one spring finger having a proximal end joined to said base portion and a free end opposite said proximal end, wherein said second lock member has a lock position in which said free end of said at least one spring finger is configured to engage said plurality of ratchet teeth and an unlock position in which said free end of said at least one spring finger is spaced from said plurality of ratchet teeth, wherein said at least one spring finger is displaceable radially inward relative to the axis of said threaded body portion to switch said second lock member from the lock position to the unlock position and disengage said at least one spring finger from said plurality of ratchet teeth, characterized in that said head portion of said threaded member is configured to receive said second lock member and includes a flange configured to engage said base portion of said second lock member. <EOS>