A linear adjustment mechanism comprising an adjustment plate, an adjustment nut, and a holding plate, characterised in that: the adjustment plate comprises: an exterior-threaded section configured to engage with the adjustment nut; a mounting-bolt opening configured to receive a mounting bolt; and a clamping-bolt slot configured to receive a clamping bolt; the holding plate comprises: a horizontal section having a clamping-bolt opening configured to receive the clamping bolt; and a feature configured to engage with the adjustment nut; wherein the holding plate is configured to engage with the adjustment nut such that, with (i) the adjustment nut also engaged with the exterior-threaded section of the adjustment plate and (ii) the clamping bolt inserted within (a) the clamping-bolt slot of the adjustment plate and (b) the clamping-bolt opening of the holding plate: rotation of the adjustment nut on the exterior-threaded section of the adjustment plate adjusts a linear position of the adjustment plate relative to the holding plate; and rotation of the clamping bolt secures the linear position of the adjustment plate relative to the holding plate. the adjustment plate comprises: an exterior-threaded section configured to engage with the adjustment nut; a mounting-bolt opening configured to receive a mounting bolt; and a clamping-bolt slot configured to receive a clamping bolt; an exterior-threaded section configured to engage with the adjustment nut; a mounting-bolt opening configured to receive a mounting bolt; and a clamping-bolt slot configured to receive a clamping bolt; the holding plate comprises: a horizontal section having a clamping-bolt opening configured to receive the clamping bolt; and a feature configured to engage with the adjustment nut; wherein the holding plate is configured to engage with the adjustment nut such that, with (i) the adjustment nut also engaged with the exterior-threaded section of the adjustment plate and (ii) the clamping bolt inserted within (a) the clamping-bolt slot of the adjustment plate and (b) the clamping-bolt opening of the holding plate: rotation of the adjustment nut on the exterior-threaded section of the adjustment plate adjusts a linear position of the adjustment plate relative to the holding plate; and rotation of the clamping bolt secures the linear position of the adjustment plate relative to the holding plate. a horizontal section having a clamping-bolt opening configured to receive the clamping bolt; and a feature configured to engage with the adjustment nut; wherein the holding plate is configured to engage with the adjustment nut such that, with (i) the adjustment nut also engaged with the exterior-threaded section of the adjustment plate and (ii) the clamping bolt inserted within (a) the clamping-bolt slot of the adjustment plate and (b) the clamping-bolt opening of the holding plate: rotation of the adjustment nut on the exterior-threaded section of the adjustment plate adjusts a linear position of the adjustment plate relative to the holding plate; and rotation of the clamping bolt secures the linear position of the adjustment plate relative to the holding plate. rotation of the adjustment nut on the exterior-threaded section of the adjustment plate adjusts a linear position of the adjustment plate relative to the holding plate; and rotation of the clamping bolt secures the linear position of the adjustment plate relative to the holding plate.