A device (300; 400; 500), comprising: a tubular distal member (304; 404; 510) including a lumen extending therethrough; a tubular extension member (310; 410; 502) including a proximal end , a distal end and a lumen extending therethrough, the distal end disposed about the tubular distal member (304; 404; 510); a tubular proximal member (302; 402; 501) including a lumen extending therethrough; a shaft (330; 430; 530) extending distally from the tubular proximal member (302; 402; 501); and a locking assembly configured to fix the tubular proximal member (302; 402; 501) and the tubular extension member (310; 410; 502) with respect to each other at a desired position; wherein the tubular proximal member (302; 402; 501) is slidingly disposed within the proximal end of the tubular extension member (310; 410; 502) and adjustable in a telescoping fashion to a desired position that corresponds to an adjustable effective working length of the shaft (330; 430; 530); wherein the locking assembly comprises one or more protrusions (318; 418; 518) about the tubular proximal member (302; 402; 501) and plurality of apertures (316; 416; 516) along the tubular extension member (310; 410; 502), and wherein the protrusions (318; 418; 518) and apertures (316; 416; 516) are alignable to fix the tubular proximal member (302; 402; 501) and the tubular extension member (310; 410; 502) with respect to each other at a plurality of different predetermined desired positions, wherein the tubular proximal member is configured to slide with respect to the tubular distal member such that the distance between the tubular proximal member and the tubular distal member changes when the tubular proximal member and the tubular extension member are fixed with respect to each other at said different predetermined desired positions. a tubular distal member (304; 404; 510) including a lumen extending therethrough; a tubular extension member (310; 410; 502) including a proximal end , a distal end and a lumen extending therethrough, the distal end disposed about the tubular distal member (304; 404; 510); a tubular proximal member (302; 402; 501) including a lumen extending therethrough; a shaft (330; 430; 530) extending distally from the tubular proximal member (302; 402; 501); and a locking assembly configured to fix the tubular proximal member (302; 402; 501) and the tubular extension member (310; 410; 502) with respect to each other at a desired position; wherein the tubular proximal member (302; 402; 501) is slidingly disposed within the proximal end of the tubular extension member (310; 410; 502) and adjustable in a telescoping fashion to a desired position that corresponds to an adjustable effective working length of the shaft (330; 430; 530); wherein the locking assembly comprises one or more protrusions (318; 418; 518) about the tubular proximal member (302; 402; 501) and plurality of apertures (316; 416; 516) along the tubular extension member (310; 410; 502), and wherein the protrusions (318; 418; 518) and apertures (316; 416; 516) are alignable to fix the tubular proximal member (302; 402; 501) and the tubular extension member (310; 410; 502) with respect to each other at a plurality of different <EOS>