I need a collet extension. I am thinking of buying Router Technologies EX 2080 Xtreme Xtension Professional Router Bit/Collet Extension - https://www.amazon.com/Router-Techn...d=1469553587&sr=1-3&keywords=collet+extension. The advantage is that it can be used with 1/2" and 1/4" shank bits. Does anyone have experience with this? My concern is that the bit is fastened with a hex-screw rather than a threaded nut. The other option I am considering is CMT 796.001.00 Router Collet Chuck Extension for 1/2-Inch Collets, 1/2-Inch Shank with the limitation that it accepts only 1/2" bits. Any guidance will be appreciated.