Actually, Rod, I posted a comment which directly addressed your inquiry just a day or two ago. To avoid creating a duplicate thread regarding Richard and the TRT, suggest having a go at the forum search engine. Your answer should come up immediately!
Actually, the best unsolicited advice offered to me when I was relatively new to the 40 family is to have a go at the forum search engine. Given that, over the years GT40s.com has been around, nearly every possible topic has come along and been dissected (at some extrodinary length in some cases as you'll see) by some pretty savvy characters. You'll find 'search' works like a charm damn near every time!
Best regards,
T.