Just wanted to do a quick review on this item, as I see no reviews for the various vendors that sell it.  Basically, this little tool will trim the excess mushrooming off of your tip.  Now, it's not so simple to use as in you jam your tip in there and twist it!  First, you have to be sure you set the depth right.  You want the tip of the blade to be just above your ferrule when you insert the tip in, and I'm talking just a hair above it.  You adjust the depth by twisting the knob in and out that is located on top of the tool.  What this will do is make it darn near impossible for you to accidentally cut you ferrule.

Once you get the depth adjusted, you actually trim the tip.  This is fairly easy to do once you figure out it. The way I did it, was hold the shaft horizontally in my left hand (I'm right handed) and held the trimmer in my right hand.  I rested the joint end of the shaft on an armchair so it wasn't flopping around.  Make sure you hold the trimmer with the blade facing up, so you can see whats going on.  Next, you just insert the tip into the trimmer, and slowly rotate the shaft.  You will have to hold the tip up against the blade while you are doing this.  Keep in mind, you are NOT trying to slice off a section of the tip, rather you want to "shave" the leather...You won't end up with a strip like peeling an apple, you'll have powder leather residue.  Take off small amounts at a time like this, it doesn't take long to get a tip trimmed down.

Once you are done, burnish your tip using whatever method you usually do, and you're ready to go!

Hope this helps....I think this is one of the greatest gadgets that porper (or anyone) has came out with for mushrooming tips!
Just wanted to do a quick review on this item, as I see no reviews for the various vendors that sell it. Basically, this little tool will trim the excess mushrooming off of your tip. Now, it's not so simple to use as in you jam your tip in there and twist it! First, you have to be sure you set the depth right. You want the tip of the blade to be just above your ferrule when you insert the tip in, and I'm talking just a hair above it. You adjust the depth by twisting the knob in and out that is located on top of the tool. What this will do is make it darn near impossible for you to accidentally cut you ferrule. Once you get the depth adjusted, you actually trim the tip. This is fairly easy to do once you figure out it. The way I did it, was hold the shaft horizontally in my left hand (I'm right handed) and held the trimmer in my right hand. I rested the joint end of the shaft on an armchair so it wasn't flopping around. Make sure you hold the trimmer with the blade facing up, so you can see whats going on. Next, you just insert the tip into the trimmer, and slowly rotate the shaft. You will have to hold the tip up against the blade while you are doing this. Keep in mind, you are NOT trying to slice off a section of the tip, rather you want to "shave" the leather... You won't end up with a strip like peeling an apple, you'll have powder leather residue. Take off small amounts at a time like this, it doesn't take long to get a tip trimmed down. Once you are done, burnish your tip using whatever method you usually do, and you're ready to go! Hope this helps.... I think this is one of the greatest gadgets that porper (or anyone) has came out with for mushrooming tips!