Aftermarket Woods finish-mower blade spindle for select RM59 and RM500 series rearmount mowers. This assembly is commonly used as a replacement for Woods 23903 and cross-references 28897, 3761, and 3763. Compatible Woods models Fits select Woods RM500, RM500-2, RM59-1, RM59-2, RM59-3, RM59CO-1, RM59CO-S-1, RM59K-1, RM59K-E, RM59LB-1, and RM59SB-1 finish mowers. Confirm before ordering: Fitment can vary by serial number, deck configuration, or prior repair. Match the original part number, mounting-hole spacing, shaft dimensions, and pulley and blade connection to your existing spindle. Function and construction The spindle supports and rotates the mower blade in the deck cutting system. It is built as an aftermarket replacement for normal finish-mowing service. Installation Compare this replacement with the original spindle before installation and transfer or replace related hardware as needed. Do not modify the deck or spindle until fitment is confirmed. If dimensions do not match, contact Flip Manufacturing before installation.