User:Darkhorse/Sandbox

Oftentimes the question of ball plug potentially affecting the mass properties of a bowling ball arises.

The general consensus is that ball plug will not have a significant affect to the mass properties of the ball. If you have access to a DeTerminator, you can verify the PSA of the plugged ball. If you have access to an RG Swing, you can determine if the low/ high RG value has shifted, but none of us have access to that particular machine, so we do the best we can with what we have.

Per MathIsTruth [http://forum.bowlingchat.net/viewtopic.php?f=13&t=3767 ]:

After finishing some work this evening, I decided to investigate the idea TOP5 had about drilling a balance hole and then plugging it to change core dynamics. I took an asymmetrical ball and drilled it with a 65x4"x30 layout, then drilled a 3.5" deep 1.25" P4 Double Thumb balance hole, then I plugged the balance hole with material at a density of 1.1 g/cm3. I believe this to be close to the density of common plug material, correct me if I am wrong. The Low RG value remained virtually unchanged so I will only report the mass, and int diff/total diff of the ball. I would still suggest drilling the finger holes deeper and keeping the balance hole. Hope this helps...

Undrilled 16.06# 0.012/0.052

No BAL Hole 15.81# 0.022/0.055

P4 BAL Hole 15.55# 0.035/0.069

Plugged BAL Hole 15.72# 0.021/0.055