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The abrading surface is the side of the bit and when you go forward you are pushing the point into the grout, which can snap the bit. In any case, these problems are mostly avoidable.The first key point is to be slow and gentle, particularly with the 1/16 bit, which is the one I had to use since I was de-grouting mosaic tiles. Some people have complained about its usefulness and the tendency for the bits to break. I suggest you leave them for last when you are familiar with the tool.
Any bit this small can break if too much pressure is used. I would recommend this attachment for anyone planning to remove grout. Pull, lift, pull, lift. This is a good SOP with any tool that has a small part, bulb, cutting edge etc. Grinding up grout takes time and nothing Dremel makes is suitable for brute force.
This takes a bit of concentration, since we are so used to back and forth motions.The attachment is better than the bit alone, although you have to do corners without it. that can either break or wear out easily. I think this complain is about the 1/16 inch bit. There is a tendency without the attachment to bear down too hard with a naked bit and the guide tabs help keep you in the grout and off the tiles. Start very slowly and gradually see how you can speed up without having to force the tool.
The second is to remember to NOT go back and forth. And buy an extra bit. (I didn't need mine).
This little attachment saved me about 2 days of working on my hands and knees chiseling out my grout lines with a hammer and screwdriver.Well worth the money.
Worked great and saved me a lot of time, but I found that it worked better without the plastic cover attached. I had really thin grout lines however I think the cover would be great for grout 1/8" or larger.
I purchased this tool thinking that it would be faster than removing grout by hand. Sounds like a cool idea but a complete waste of money. With this tool, it takes ten times that.
It is extremely slow even with a full 1/8 inch carbide tip bit - not supplied. But the grout grinds away these notches after about 10 minutes of work. But it is not.
In addition, the plastic base has two notches to guide the tool in the grout joint. The included bit is even smaller. By hand, with a double bladed hand-held small grout saw I was able to remove 1/4 inch grout at a 3 feet per minute pace.
A completely ineffective tool. Do yourself a favour and don't buy it.
like several reviewers, I found the bit useful for freehand removal of grout but the attachment is awkward
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