Paul,

I have a old single speed Fein that I almost sold 'cause it sat on the shelf since it was a poor sander. I never got around to selling it since it would not bring many $$$. Once I tried it with the saw blades I wouldn't part with it. The old single speed models are a perfect saw.

I use the Dremel bi-metal blades (Menards or Home Depot) to cut nails all the time. It does shorten the life of the blade but for a tight spots it's prefect. The blades will not cut hardened steel like a concrete nail... it will immediately turn a bi-metal into a scraper

jim