I have a yardman manufactured in 1996, 38 inch deck number 136A694F401. Last two times I mowed, there was an awful racket coming from the right side of the mower deck. Normally when the mower runs with the blade down, it makes a pleasant whirring noise. I dropped the deck and took it out and looked at the blade spindles. The one on the right side wobbled around in the bearing support, the left side one is tight. I found out the diagram and ordered two spindles from an aftermarket supplier. Should be here in todays FEDEX delivery. I wrote MTD and asked how in heck do you remove the blade adapter. They wrote back and said the adapter cannot be removed. Then how in heck did they get it on the shaft? Certainly the shaft and adapter wasn't machined from one piece! Replacement spindles show a shaft without the drive pulley which is splined and the blade adapter shaft is also splined.