I have seen the vid on the Motion hole drilling and it looks good to help maybe the bowlers who have not got a lot of revs and finish on their balls. What bowlers have tried this drilling and what effect has it had on their game. Thanks for any replies.

Symmetrical simple design cores seem to work well.  For me, it gives a touch more length and a little stronger corner on the backend. 

I've tried with stronger covered balls (hoping to use on fresh), but this didn't work out very well.  Over/under reaction.  I needed dried, broken down conditions where I could move inside.  Under these conditions, the layout was money.  Really liked the layout on a Rotogrip Wrecker

I have done 3 Motion holes on various balls.  It's totally dependent on your stats. especially initial axis tilt.  Low tilt are better with Motion holes medium to high tilt better with P3/P4 holes.  Do more research on bowlingchat.net lots of info. there.

Best reacting Motion hole ball that I have is an original Yeti. 

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.

Thanks for your help gents, I might just get it done as its an old ball and may well give me some idea on what the drilling does for me. We still have to experiment even at my age I still want to get better.

Have just seen a thread on this topic and it seems it would work better on a low RG ball. It seems that some bowlers have had good success with it.

I've had great success with Motion holes on the Storm Optimus, Roto-Rrip Haywire and Roto-Grip Outcry... You can tweak the surface to get that drilling to read as long as one usually needs... CharlesT is spot on with length/dynamics/control... feels like it raises the balls RG substantially IMHO. I use it mainly on a THS when you get that weird grab in the front and the ping in the back from hold and you need to go left with your feet but look right to go around it.

That being said... they look awful on flatter shots for me unless i add a lot of surface.

I put the mo-hole on a Columbia Severe Delirium (was on close-out).  Brought the surface to 1000, at it became a long, hi-rev, continuous control beast.  Pin is above ring finger, about 30 degrees over, CG in center of span.

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