KK used a Ceramic Hybrid bearing and removed
both seals.That bearing is more 'expensive' than the usual $3 steel bearing, not cheaper.
Nothing wrong with the bearing spec but it failed in his engine.
https://rennlist.com/forums/996-forum/750825-different-approach-to-diy-imsb-retro-parts-and-pics.html
"As to the cautionary tale of KK, he was trying to use a cheaper bearing with inferior ratings to do the job."