No matter how expensive a rig is, it always lacks a well weighted tuning knob. N8BX tried to change that and created a small company (www.73cnc.com) making weighted knobs as an alternative to original ones for many known rigs.
I was tempted to buy one for my FTdx 5000.The replacement is very easy and the result is fantastic. The inertia of the new weighted knob gives sensitivity and excellent feeling in tuning procedure. It is a knob that FTdx 5000 truly deserved it in the first place. Just to compare: the new knob weights 700gr instead of 250gr the original one.
original (plastic) N8BX knob (full metal)