This guy in Texas did two older transponders for me last year including one of the real old rectangular models with the four screws in the case (was new somewhere around 2000). He’s not expensive, turn around time was very quick, and he sends texts to let you know progress. There’s a number on the site where you can call or text with questions. He also sells charging bases that have a timer built in so if you have multiple months in between races, it will automatically charge the transponder for 24 hours and then wait 30 days and do it again on a continuing 30 day cycle. I got one that has two slots so I can charge both transponders at the same time.
This reply was modified 12 months ago by Bruce Peck.