My mate couldn't recall a black box being fitted...but it is there in the pic...If you look at the pic of Jeffery's mower, there is no provision for a push rod through the cowling or crankcase for a push rod, I think Ty is correct...it may be part of what is described in the brochure (right at the bottom) the Magister magneto's secret!
Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member. Kindest Regards, Darryl