These trimmer capacitors may also be called variable capacitors or potentiometers. Note: Trimmer Capacitor may vary color and size from 5 to 10mm.
A simple slide potentiometer can go a long way. Rated at 10KOhm and 0.1W. Comes with solder lug connections. The pot has an overall travel of 30mm and has two mounting holes on top. Dimensions: 9.5mm x 45mm.