For those interested in even tighter connections, try using expanding banana plugs. A tightening collar or screw expands the plug into the jack, thereby ensuring a tight, wiggle free connection. They even come in a 45 degree version for tight spaces.
These can be purchased from various suppliers...or even on ebay.
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Outlaw 990; Carver TFM45 (mains); Carver TFM35 (surrounds); Carver TFM24 (bridged for center); Carver TFM15CB (rears); Acoustic Research AR9 mains; Polk CS400I center; Polk FX500I surrounds; Polk FX300I rears; Sony KDS-60A2000; Oppo DV-981HD; MX-850