Re: Threshold installation
If your threshold has a flat bottom (rare but nice) you can use "Liquid Nails" to set it, leave it for 24 hrs and it's done. Otherwise, drilling into concrete is futile without a hammer-drill. Yes you can use a concrete bit in a standard drill but the point burns up in about 15 seconds and is useless after. Lags are nice if you have the time to seat them and are accustomed to using them but tapcon screws are better if you don't plan on making a career of setting things into concrete.
If I only knew what I was doing!