That ¡°retaining spring¡± in the clamping nut is an integral part of the ¡°ER¡± series of collets.? One is supposed to insert the collet into the nut before mounting it on the collet holder, and remove it from the nut after removing it from the holder.? When the nut is loosened, the purpose of the spring is to capture the collet to pull it out of the holder.
I'm going to make a collet holder, using the instructions from Doug Collinge (from this forum). Just got the collets and the collet nut (shipped from Denmark, but made in China). The quality looks good enough for my needs, I'll check runout when I get it setup.
My question: The nut has a retaining spring, which maybe for a router might make sense, but makes for a PITA when changing collets. Is it necessary to have this retainer? Can I remove it? I'd like to put the collet away after each use, and see no need to keep it on a leash.