That's insaneI cleaned up this early model Wright reciprocating saws this week. The rod to drive the blade comes directly off the top of the piston with seals in the head.
Not mine, but illustrates the principle.
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Mine
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I'd really like to find an air filter cover for this one to complete the ensemble. From looking at Mike Acres site I'd say it may be a B316 or GS-2016 ? ?
Mark