We are considering replacement of a linear guide on [machine/application]. Existing block: [full designation, serial number or unknown fields]. Rail: [identification]. Assembly: [rail count, block count and pairing symbols]. We attach photographs and available drawings.

Does the manufacturer permit candidate [designation] to replace the block alone on this existing rail? Please identify differences from the original preload, accuracy grade, seals and lubrication specification, any matched-assembly requirement and the basis for your answer. The rail condition is [observations/not yet inspected].

If block-only replacement is unsuitable, please state the required replacement scope and why. For requirements [accuracy, load and operating conditions], please specify included parts, inspection scope and the checks needed on the machine after replacement. Please identify any proposed specification changes for review before ordering.