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With a growing trend for high-MOI mallets on tour, putter designer
Guerin Rife set himself a challenge to design a putter with double the
MOI of many of the most popular high MOI head designs on tour.

“I noticed more and more lately that many players on the PGA Tour are
opting for high MOI oversized putter head designs,” explained Rife.
“They have to stand over a 4-foot putt worth $200k to $1m that will
change their life. The pressure can be paralysing.”

The nerves don’t have to take over too much for an extremely costly
miss, so highly stable putter designs that help to counter some of the
potentially damaging effects of pressure and nerves make absolute sense.

Evnroll 1

MOI, or Moment of Inertia, is essentially an object’s resistance to
twisting. “For a putter, that translates to a rock steady swing path and
an enlarged area of forgiveness off the face. So all you have to do is
aim,” says Rife.

RELATED – Moment of Inertia explained

Many of the latest oversized super-stable head designs on tour boast a
5,000 MOI. The ER9-10K Extreme mallet that Evnroll unveiled to the
golfing world at the 2018 PGA Merchandise Show takes that figure and
doubles it, up to an incredible 10,000 MOI. 

To achieve ultra-high MOI it requires a really big putter head that
is usually a combination of ultra-light aluminium and stainless steel
that is about three times heavier. The ER9 features a milled 6061
aluminium body with strategically located hollow cylinders running the
length of the head from face to rear along the extreme heel and toe to
receive sizeable steel weights. This design keeps the overall size down
to manageable levels while still achieving an astonishing 10,000 MOI.  

Evnroll 2

The head shape is essentially square with a wide central cavity
framed by alignment lines along each side and a single line in the
center. This shape allows for a full range of short to long rod weights
to dial in swing weight based on shaft length, grip weights and counter
weights. To help reduce the size visually, the ER9’s aluminium body is
anodized in a dark grey satin finish. 

RELATED – Evnroll extends putter line for 2018

Like all Evnroll putters, the ER9-10K features award-winning “Sweet
Face” Technology, an innovative and unique mill pattern engineered to
deliver uniform performance across the entire hitting area of the putter
face for unprecedented accuracy and zero dispersion. However, because
of the extreme stability created by the 10,000 MOI, the parabolic
grooves have been dialled back to produce the same energy transfer and
gearing effect for off-centre hits.  

Evnroll 3

The ultra light aluminium body with long heavy steel weights running
along the length of the heel and toe allows for 15% more head weight,
yet the ER9 swings effortlessly along the swing plane and “feels” like a
much lighter swing weight. Having the lighter feel with the heavy head
weight delivers excellent distance control and deadly accuracy.

MORE – Looking for a new putter? Look no further…

Even the grip on the ER9 features high MOI. Evnroll’s patent-pending
Gravity Grip features a 70g, 10” steel rod that travels the full length
of the deep V underside of the grip. This places 85% of the grip’s total
weight in the fingers below the shaft, promoting a toe-up square face
to the swing plane.  Weighing in at 120g, the Gravity Grip also acts as a
counter weight to the additional head weight, providing even more
overall stability. 

The ER9 will admittedly not appeal to all, especially
traditionalists, but for those who absolutely, positively want to make
every pressure putt, the ER9-10K will deliver.

“Having a putter that is so stable that it overrides nerves is often
the key to success,” adds Rife. “The ER9-10K is stability on steroids!”

WATCH: Why it’s so important to get your putter custom fitted

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