I have a hand throttle the same as that on my series 3. I purchased it new and it is a linkage set up. It just has an arm that controls the throttle rod that runs across the bulkhead. I will take a few pic of the mechanism for you. Yes it's a scorcher here today too, almost forty by lunch time, I was sweltering in the shed. Good win with the wading plug, they are scarcer than the jack deflector brackets. Cheers

