A good source for parts & tools, as previously reported, is McMaster
Carr Supply Co.  They have a huge 3,000+ page industrial catalog
containing items from a 0-80x1/8" pan head stainless steel machine
screw to a 12 ft. x 17 ft. storage building.  Company headquarters is
in New Brunswick, NJ USA, tel. 908 329 3200.  Boston Gear address is
14 Hayward St.  Quincy, MA USA, tel 800-343 3353.