[chrisguyw]

Is the TSRF chassis still in production, that uses a pin.

While they are still available at some retailers, they have not been in production for ages,......the initial chassis had a plastic/nylon "keel" (looked like a sharks fin),....with an upgraded stainless  steel "pin" available in 2004(ish),........the "pin" was definitely better, but, many/most modified the chassis to accept a traditional "flag".

From a pure performance perspective "pins" were just fine, and, very quick to Marshall,.....however, "pins" did not help keep the braids separated, so, in a crash the braids could twist/tangle/touch (not good), and also, if you did have an "off", the pins were very adept at finding their way back into a slot, (generally not yours).  

A pin could also be affected by the less than smooth/worn edges of a slot track, particularly the old 60's particle board commercial tracks.

The issue of "braid fouling" is the reason that most manufacturers have adopted the guide flag over the pin, particularly valid when considering use by kids/beginners.

Cheers
Chris Walker