I searched up Josh's thread, because I thought this was a good place to add.
I recently upgraded line rollers for my two 4000/5000 spinning reels.
Shimano and Daiwa both use chromed brass for their line rollers.
On any spinning reel, this one tiny BB does more work than any other.
- the brass roller is the reason they need seals in the salt.
Shimano's good grade roller has chromed brass line roller, one ball bearing, nylon sleeve, rubber seals, and packed with lithium grease.
The grease will have a finite life, salt ingress will add green deposits from the brass, and these parts will need rebuilding
The Japanese, MTCW/Jackson, offer a titanium upgrade, braid-specific only for 30-lb and finer, and designed to drop the braid into the roller groove quicker.
though it looks anodized, the finish is simply titanium heat-tint
They also don't need seals, replace them instead with 2 ball bearings, and they spin like a bicycle wheel.
They don't need grease, and you can simply keep them oiled with a hydrophobic-filming bearing oil like McLube One Drop.
The titanium roller is here to stay.
You'll still need to replace the bearings every few years, but no seals to futz with.
MTCW (MetroTech) builds these parts, and packages some with their trademark.
Jackson is a big-time lure maker with wide distribution, and the part packaged with Jackson trademark is Shimano specific. https://www.hedgehog-studio.co.jp/produ ... mit=Search
MTCW-packaged parts include versions for Shimano, older Daiwa, and newer Daiwa