The motion hole layout works on symmetricals, it's a craps shoot on asymmetricals.  Asymmetrical cores are just that, asymmetrical, so you don't know what the area of the core you're drilling the motion hole in looks like.  So it works on some but not on others.  That's why Mo stopped recommending it for asyms.  --  JohnP

Nailed it

I always check a plugged ball for cg location, it usually ends up fairly close to the marked cg.  I only check a new ball if the numbers appear to be suspect.  If I'm drilling for someone that doesn't want a balance hole and using a layout that will be close on static legality I check the weights before drilling to be sure it will be OK.  Side weight will be very close to the check, finger/thumb weight will depend on the size and depth of the holes drilled but will give a good estimate.  --  JohnP

Quote from: kotm on July 26, 2016, 05:08:21 PM

Quote from: Strider on July 25, 2016, 05:50:48 AM

I don't know if he's right or not, but my pro shop told me not to put a motion hole on an already plugged ball.

LOL.

Drill away G.

I've since changed shops, but maybe he was concerned where the new CG would be after plugging?  Maybe good shops check (even a new ball) for the CG before drilling, but I've never seen one do it.

Anyway, I had a weight hole plugged on a Brunswick Ringer and added a Motion hole.  So far I like it.  Threw about 6 or 7 shots on Viper and it got down lane much easier and made a pretty strong move down lane.  I'll also throw in on a house shot on Thursday.

If properly placed, make the hole bigger in 1/8" increments until you like the ball reaction.  You may have to skuff the cover as the hole size increases.  Operators need to know how to remove the weight correctly and still hit the core in the correct quadrant....  it doesn't require much critical thought...