I should add that for safety, I used some leather gloves, safety glasses and placed a rag aroung the glass to catch any fragments.
Tip - I have also found that nitrite gloves, which are a silicone/rubber type substance sprayed onto stretch nylon knit gloves, are great for Dremel work. They are thin so you have the tactile feel through them yet the nitrite gives a very good grip on things even if wet, oily, or dry, and resist chemicals & solvents - even with handling small items. I recommend them and you can find them for $2-5@ at Walmart, Lowes or Home Depot. Also Auto Zone, as mechanics gloves.