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Which option is best? This decision is left entirely to you. Whatever solution you choose, the seal needs a proper fit to function.

Loosen the securing-clamp bolt at the base of the distributor, then carefully withdraw the distributor.

Sealing lip

Lubricant Amount - Seals will always perform best when lubricated, however in some machines there are more likely to be dry spells. For these cases, selecting a leather or PTFE seal will be beneficial, as both can operate with less lubrication than others.