I like my Tobeco KF4 clone... well, "liked." I decided to install one of those plastic bellcaps for a different look, and now I can't get the base section fully disassembled; it feels like the small spring has seized up and/or snagged on something, and the usual tricks to get seized mod/atty parts unstuck aren't working. So my advice is to not over-tighten anything. It does have a bit of a learning curve with the airflow control, so take it slow.