Noob with a new mx5 Saturn build.

[TalonMotorFabrication]

I think the whole crush tube,bracket and polybush thing needs putting in to context some what here.
The polybushes rotate around the crush tubes and rub against the sides of the suspension brackets and every thing is new when you are assembling the wishbones or moving them by hand you only exert may be 30-40lbs of force, a fully built 550-600kg car and 250-300lbs springs will find it much easier to move. You need to take normal wear and tear in to account before you introduce fore and aft movement in to the wishbones by shaving bits before they have had a chance to bed in on the road. The polybushes on these cars are seen as consumable and they will bed in after a 150-200 mile shake down, after 2500-3000 miles they will need replacing.