Basher
Pinnacle OPE Member
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Stihl used those for a time in the early 034/044/064 saws - The thinking was that the shields would protect the bearings from debris.
It didn't end up working out that way.
Fines getting through or around the airfilter. Figured that is why my 044`s never had bearing problems, my new MS440 did, plastic bearing spacers disintegrated.