Hi RcPete:
Just purchased a Hot Spot & Robart 630 retract, strut, wheel & brake package from Planes Plus. Same problem here. Robart axles for mains are 1/4 in. and BVM wheels and brake drums are 3/16. To make matters worse, BVM states in their documents not to attempt using any other type of axle as they will not be accurate enough to function, probably inplying not do do something foolish such as enlarging the 3/16 in. fit. Sound reasoning also tells me not to drill out the BVM wheels and brake drums. Contacted Planes Plus twice and no reply. Contacted Robart and no reply. Will now contact BVM for their say in the matter. Will keep in touch.
Saludos,
Pedro