The Throttlemeister operation was just a small side business for Marker Machine in the Milwaukee area. Evidently they got tired of the Throttlemeister part of the business and closed it off.
I believe Marker is still going, but the last time I called they were very, very uninterested in discussing the motorcycle parts.
I've been using them since on my old Connie back in the late '80s I think. The prices when they appear on Ebay have gotten pretty extravagant.
A bike just doesn't look right to me without them.
The current HVMP is a potential replacement to some degree, without the lock feature.
2004 V-Strom 650
2020 Ninja 400 in the hands of the Missus
2004 Suzuki SV650S, also Hers
2008 BMW F800ST, mixed.
In the avatar: 1966 Velocette Venom Thruxton and 1967 BSA Royal Star.