Help align the chain with the sprocket and the bar.
Prevent damage to the aluminum (sometime magnesium) casing from cutter d\hitting the casing.
Provide a positive seal between the bar and the oiler channel.
As not having a safety the IPLs that I looked all show it once had a brake though parts may not be available new anymore. Either or you have a really old unit before they started adding the brake systems.
Answer
They provide three things that I know of.
As not having a safety the IPLs that I looked all show it once had a brake though parts may not be available new anymore. Either or you have a really old unit before they started adding the brake systems.
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Thanks for your input Eugene. It seems to me that if you keep an eye on chain tension they are not really needed.
Pat
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