Yes, its a button that locks on 748/916 and I think the mechanism for it is in the throttle itself pushing the button moves the throttle a small amount and when you turn the throttle the button pops back out.
Its a lever like a choke on the S4 and you can control to a certain degree how much you want to open the throttles which can sometimes be a bit hit and miss. The lever is part of the switch gear housing so maybe its different switchgear you have?
Easiest would maybe to try and fit a 916 style throttle assembly.
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S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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