Bad heads on RL02: Worth replacing

So one of my RL02 drives (bought on Ebay years ago) is eating RL02 packs. Makes tings, then the disks have errors in my other RL02 drive. Took a bit to figure out which drive was eating what, but I'm 100% certain it's this newer drive. So pulled the heads. The top one had significant gunk on it, the bottom one a bit. Pics below. Top: https://i.imgur.com/FELhF9X.jpg Bottom: https://i.imgur.com/Tmsf5Nd.jpg With alcohol and lintless swabs I managed to clean both of the heads up. Top: https://i.imgur.com/gmACM4R.jpg Bottom: https://i.imgur.com/SfZQV5F.jpg Then put them back in the drive and mounted a scratch pack. With finger on the load/run I let the drive spin up and when I heard tinging I immediately spun down. Hopefully I didn't trash my scratch pack. Top head has gunk, bottom one had a few flecks, but looks pretty ok. Top: https://i.imgur.com/EAvgmuH.jpg Bottom: (picture didn't upload) Obviously the head is crashing, any idea why and if it's worth replacing the head or should I put this drive out for parts? Yes I cleaned the RL02 pack before putting it in. Never dull. CZ