The instruction book for the 5-30 has a 20 page major overhaul section.
There's one on eBay for a reasonable price.
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/323848641397
I don't have a working scanner right now but I could take pics of specific sections for you.
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that book is on the way. thx.
belt has couple cracks. any out there?