Update: I have had this pen for a over a month now. I decided to convert the pen
to use Parker refills. You need to drill the pen tip to so the Parker refill
will fit into it. Next, remove the plastic end of the Parker refill, but plug
the end flush to the refill end. Finally you may need to cut the spring in half.
Now I have an awesome pen that will accept Parker refills.
The Rotring 600 drafting pencil is awesome. I have the 0.7 mm model and it's
used for writing. It's smooth and the balance is perfect. Oh, it also looks nice
too. This also writes nice with colored lead.
Don't waste your money. The body of this pencil is plastic. I was expecting the
body to be all metal for the price I paid. For my money the OTHO Promecha in any
style is a better deal. The pencils are all metal and built to last.