Epay has a fairly large variometer listed under crystal radio stuff, its 4 inch diameter and 9 or 10 inch long, cheap right now, maybe good for someone wanting to load an antenna, http://www.ebay.com/itm/Ham-Radio-crystal-variocoupler-variometer-high-power-steampunk-tuning-/351619953102?hash=item51de2eb1ce:g:vVoAAOSwLN5WideJ 73 Merv K9FD/KH6 WH2XCR