In trying to record and preserve historical events in the production of Shopsmith Mark 5 and Mark V I was going through some older documents and came across Bulletin 513046 in my files dated 10/72.
That was just after Bob Folkerth acquired Shopsmith and formed Shopsmith Inc. There was a tidbit of information that isolated changes in the Mark 5 / Mark 5 that had some serial number references to them.
I realize that Shopsmith has a publication titled "Replacement of the Poly V or Gilmer Belt 521691 / 521683 but the attached has serial number references to production not contained in it.https://www.shopsmith.com/ownersite/pro ... cement.pdf
See the attached 1972 Document on Changing a Gilmer Belt
The Idler Shaft in the Eccentric Bushing was stated to be positioned to protrude 1 1/16" from the Headstock Casting.
On Mark 5 above Serial Number 267305 one was instructed to tighten the setscrew in the Eccentric Bushing so that it would seat in the groove around Jointer Drive Shaft Bearing
Notice was given that if Serial Number was above 298476, these units would no longer have the two bearing keepers and would be equipped with a screw and washer which positions (retains) the Eccentric Bushing.
I am working to flesh out all the documents that have specific production changes in the Mark 5 / Mark V lines into a single document and reference the bulletins etc. where the data came from. It is a slow process.