Here Is how to fix the slip problem with this shockmount 
by , January 2008

Hi I just wanted to say that there is a way to fix the slip problem with this shockmount. take your shockmount and flip to the part were the two prongs are. take some pliers and pinch the very tips. dont pinch to much just a little at a time then check to see if the shockmount clip has stoped sliping out when you pull and wiggle at the same time. do this until results are met.{it worked for me}

  Doesn't stop the slip problem 
by John from Nashville, TN, September 2006
Music Background:  Recording/Mix Engineer

If you need a shockmount for you 421, get this. It does exactly what it's supposed to do. Do not buy this if you think it will fix the "clip-on" problem with the mic. Everyone knows that 421's are notorious for falling off the clip (poor design), this won't fix it.
Works great as a shockmount though.

421 Shock Mount 
by Robert Snyder from Recording Studio Owner - Texas, May 2004

A great accessory for a great mic. The design is very simple and integrates well with the look of the mic. Should the rubber rings break, You can easily replace them with O-rings from a hardware store. Although handling noise isn't usually a problem with this mic, I wouldn't get a 421 without this iso-mount.

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