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<blockquote data-quote="human" data-source="post: 437513" data-attributes="member: 1244">I was able to replace the spring with an original one off of a disused dump bag I&#039;d taken off of my other Sanitaire. It isn&#039;t as shiny as the damaged one I took off but it isn&#039;t rusty, either. My new blue Sanitaire has the word &quot;Professional&quot; emblazoned on the hood, whereas my older red one says &quot;Heavy Duty Commercial&quot; on the bag. My understanding is the blue line is intended for home use, not commercial. From comparing my two machines and looking at specifications on the Web, the main difference between the blue Professional line and the red Commercial line, other than cosmetics, is in the cord. The red line uses a grounded three-lead cord with a three-prong plug and the blue Professional line uses a two-lead cord with a two-prong plug. Also, most red line machines come with a 50-foot cord, although a 30-footer is optional. Conversely, the blue line comes standard with a 30-foot cord with an optional 50-footer. Other than that, the differences come down to warranty terms and distribution channels. The red line, I believe, is sold primarily through commercial resellers while the blue line is sold primarily through retail. I don&#039;t see any real difference in build quality between my two machines, other than the red one has a metal hood and the blue one&#039;s is plastic. Another minor difference is the blue one has slightly larger rear wheels that are set farther apart. The rear wheels on my red one are completely hidden under the chassis while those on my blue one are exposed. I believe this represents an evolutionary design change over time for both lines and I&#039;m not sure it makes much, if any, difference in handling.It amazes me that even though my two Sanitaires were manufactured some 30 years apart, they share a huge number of common and interchangeable parts. Interestingly, my red SC686 has a 6 amp motor while my blue S645 has a 7 amp motor. I&#039;m not sure how much difference that one amp makes.</blockquote>

[QUOTE="human, post: 437513, member: 1244"] I was able to replace the spring with an original one off of a disused dump bag I'd taken off of my other Sanitaire. It isn't as shiny as the damaged one I took off but it isn't rusty, either. My new blue Sanitaire has the word "Professional" emblazoned on the hood, whereas my older red one says "Heavy Duty Commercial" on the bag. My understanding is the blue line is intended for home use, not commercial. From comparing my two machines and looking at specifications on the Web, the main difference between the blue Professional line and the red Commercial line, other than cosmetics, is in the cord. The red line uses a grounded three-lead cord with a three-prong plug and the blue Professional line uses a two-lead cord with a two-prong plug. Also, most red line machines come with a 50-foot cord, although a 30-footer is optional. Conversely, the blue line comes standard with a 30-foot cord with an optional 50-footer. Other than that, the differences come down to warranty terms and distribution channels. The red line, I believe, is sold primarily through commercial resellers while the blue line is sold primarily through retail. I don't see any real difference in build quality between my two machines, other than the red one has a metal hood and the blue one's is plastic. Another minor difference is the blue one has slightly larger rear wheels that are set farther apart. The rear wheels on my red one are completely hidden under the chassis while those on my blue one are exposed. I believe this represents an evolutionary design change over time for both lines and I'm not sure it makes much, if any, difference in handling. It amazes me that even though my two Sanitaires were manufactured some 30 years apart, they share a huge number of common and interchangeable parts. Interestingly, my red SC686 has a 6 amp motor while my blue S645 has a 7 amp motor. I'm not sure how much difference that one amp makes. [/QUOTE]

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