Help! Axle Shaft to long for Center Cap

[AIRSICK]

I was wondering if anyone has modified their rear axle snout to help them fit wheels on the rear of thier IRS Type 1. I just bought some 17 X 7 +40 wheels (Eagle Alloys) and I think that the rear axle length will interfere with the wheel center cap. Has anyone modified the rear brake drum/stub axle shaft to shorten it so that it doesn't interfere with the center cap? If so how was it done? I don't think I will need to take much off, probably about 1/4" or so. I think I have room for an 8mm spacer which will help but I still may need to take some off.