Jackson Brothers was founded in 1923 to manufacture variable capacitors and accessories such as tuning drives and dials. Today, distribution and production facilities are owned by the Mainline Electronics Group.http://www.mainlinegroup.co.uk/jacksonbrothers/
Unit 1A Cutters Close
Leicester LE19 2FZ
Tel: (+44) 116 286 5373
Fax: (+44) 116 286 7797
Another option is Oren Elliott Products (OEP)http://orenelliottproducts.com/index.html
OEP was the original supplier for many Heath capacitors and planetary drives.
Oren Elliott Products, Inc. is the largest US domestic manufacturer of air-dielectric variable capacitors.
Producing capacitors since 1925, the OEP Plant I was first known as American Steel Packaging Company and then as All Star Products. In those early years, their applications and major products were almost exclusively focused on the broadcast and short-wave radio industry (which was a huge market in late 1920s and 1930s).
During World War II, ASP supplied the Allies with 3500 capacitors per day, and by the end of the war the company was the world's largest producer of air trimmers. In 1983, Oren Elliott Products Inc.'s was created and expanded into new facilities (Plant II) to include CNC lathes, CNC vertical machining centers, CNC and conventional Swiss screw machines, and all of the support equipment necessary to enable OEP not only to produce all of the machined subcomponents for their capacitors.