One online source gives the year as 1940.
Contact the manufacturer.
The Craftsman model 53677240000 lawn edger typically uses a 3/8-inch by 30-inch V-belt. It's important to verify this with the specific manual or parts list for your model, as variations can occur. If needed, consult a local dealer or the manufacturer for confirmation or replacement options.
The belt size for Craftsman model number 536886500 is typically a 1/2-inch by 89-inch belt. However, it's always best to consult the owner's manual or check with a local parts dealer for the most accurate and specific information regarding replacement parts.
The 3/8 drill is one eighth larger.
http://www.searspartsdirect.com/partsdirect/part-model/Craftsman-Parts/Grass-trimmer-weed-wacker-Parts/Model-536773510/0247/1503820?searchedModel=536.7735.100&blt=
http://www.managemyhome.com/mmh/lis_pdf/OWNM/98110089.pdf
by using a drill
The Craftsman model 917257621 typically uses a 42-inch cutting deck, which generally requires three blades. The specific blade size for this model is usually 21 inches in length. It's always advisable to check the user manual or the manufacturer's specifications for the most accurate information.
They drill water wells, usually with a truck mounted 6 inch drill.
8mm is almost exactly 5/16 inch. The wrenches are interchangable.
The recommended drill bit size for a 15/64 inch hole is a 15/64 inch drill bit.
The recommended drill bit size for a 5/16 inch screw is 1/8 inch.