Need to replace my vacuum advance on my distrutor. Did'nt think it was gonna be a big deal.2 screws right. My problem is the 2 srews are hitting the bottom of the breaker plate that the points sit on. I can rotate the plate enough to get the front one out but the back one still hits it.Is there a trick to this. I know there is a clip that holds the plate down but after looking in one of my books it looks like the Shaft with the advance weights has to slide up to allow the plate to move up which means pulling the distributor out. Just does'nt seem like this should be necessary just to replace a vacuum advance. Am I missing something?Someone fill me in on the easy way to do this.