The forum you are looking at is entirely new software. Because there was no good way to import all of the old archived data from the last 20 years on the old software, everyone will need to register for a new account to participate.
To access the original forums from 1999-2019 which are now a "read only" status, click on the "FORUM ARCHIVE" link above.
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Just a notice that we are unable to obtain some of the critical components for the Model 412DMX until 2023. With lead times out 52+ weeks that tells me...