The SVQ chassis has a flimsy nylon sleeve glued inside a thin ring of carbon-fibre. The guide rocks because the sleeve is not thick enough to give a tight fit with the typical shaft of a Slot.It or ScaleAuto guide. With the added mass of the stainless chassis and the power of the long-can motors it’s not hard to break this flimsy Guide-Boss. Preventative or restorative reinforcement can be done with a metal patch. (1) Alejandro has CNC’ed some aluminum plates appx 2mm thick that can be bonded to the top of the carbon-fibre. Dremel to fit – keep some ‘wings’ to reinforce the strut area.
(2) I have used some 1/24 brass tongues (1.5mm thick) with brass tubing soldered together into a patch I bond with epoxy to the bottom of the chassis (it can also be bonded on top). The tubing is 5mm (6/32) outside diameter (4mm – 5/32 ID) – by 4mm tall. BTW the guide becomes incredibly smooth in its sweep and has no forward-back rocking.
Again, Dremel to fit and keep some ‘wings’ to support the struts/suspension arms. When mounting below the chassis, paint the bare brass with nail polish or enamel to prevent shorts, (do not paint below the guide b/c it will bind).