I just had to replace the center spindle on our old lazer hp. It is a 1998 or 99 model and the center spindle was original. For the past week I have been soaking it with fluid film thinking it might work its way down and help free the pully up. Well today I go and put the 3 jaw puller on it and nothing happened but a tottaly bent up pully. So I tried a sledge hammer and yet again it wouldnt budge. After 2 hours of the puller and beating the ever living $hit out of it I finaly broke out the sawzall and fresh blades and went to town. 30 minutes later I was finally through that thick shaft and the old unit was free. 15 minutes later it was all back together (WITH ANTI SEIZE ON THE SHAFT). If I could get my hands on the morons (or rather the management that decides to save $.10 per mower by not useing anti seize) that assemble these things I would beat them into submission. Anyway just thought I would give that short review of fluid film as a penetrant. In this case it did nothing. Honestly I dont think anything would have helped short of a torch to heat it up and even then it probably wouldnt have budged. Fluid film does work wonders in all other areas such as protection from rust and as a lube.