Pipe clamp questions:

I have a pile of 3/4 black iron pipe clamps.

As to your questions:

1) I use regular threaded couplers (mine happen to be galvanized) that are available with the pipe in any big box store.

2) I have done nothing to the pipes to make them smoother. I do scrape off what gets on them (wood filler, glue, polyurethane adhesive, ect.) They have gotten a little smoother with use, but I never felt that I needed to smooth the pipes; that might vary by brand for clamping mechanism.

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