There are a couple of easy solutions to the spent primers "issue".
You can either add a piece of folded over electrical or duct tape around the top of the cup to add a little height. The primers are ejected under spring force and they hit hard and bounce around. The "dam" prevents their escape.
You can also make/buy a small piece of brass that you clamp under the cup bracket to which you attach a piece of hose. The primers fall down the hose into a bottle, cup, or whatever you like. Since the system is completely closed you will never have a used primer on the floor again. Some people just use a small piece of brass to make sure the primers are fully directed into the cup.
It seems the most popular 650 mods from my research:
(1) Cut the detent spring 1/2 to 1 1/2 turns - smooths out the shell plate rotation.
(2) Add a thrust washer and bearing combination under the shell plate bolt - smooths it out even more.
(3) Modify the used primer catcher with tape or a hose/bottle
(4) Add a knob or micrometer to the powder measure adjustment
(5) Clamp the toolhead with machine screws instead of pins
Some people also adapt other powder measures - I haven't seen the need.
I don't care for the primer system, but, after changing it over the only real PITA is getting the primer punch out. It is just awkward. The instructions for changing the primer size make it sound much worse than it is, in my opinion.
Last edited by rodell; 11-08-2010 at 07:31 AM.
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