RetroFit Shaft Adapter, Replacement for Callaway OptiFit

Extremely Rigid Connection, Save 6 Grams

ATTAC, Tempa Flow, CV Slide Springs, Shaft Extractor, Snow Ski Damper

Holtzman Engineering, Inc.

Our president, Mr. Holtzman, has been an inventor most of his life. He has been issued 24 patents in diverse fields such as electrical power distribution, carburetion, nitrous oxide delivery, golf clubmaking, skiing, and bowling ball balance. For over 25 years, Holtzman Engineering, Inc. has been producing innovative consumer products.

ATTAC, Tempa Flow, CV Slide Springs, Shaft Extractor, Snow Ski Damper

How to Purchase

Our Carburetion Products, Golf Club Making Products and Snow Ski Damper can be purchased through this site via PayPal  If you do not have a PayPal account, you can still pay by clicking on the tab that says "Pay with a Credit or Debit Card".  Call if you have questions about these products, (715) 617-8727.
For Nitrous Oxide Products, contact Straightline Performance at, or (651) 466-0212.
For Holtzman Bowling Ball Scale, contact Jayhawk Bowling at, or (785) 842-3237.


Holtzman Engineering, Inc.


3907 Evergreen Road | Eagle River, WI 54521

Copyright © 2014 Holtzman Engineering, Inc. All Rights Reserved. Website Designed and Hosted by: Northern Computer Service, LLC.

Holtzman Engineering - electrical power distribution; carburetion products: ATACC, Tempa Flow, and CV Slide Springs; nitrous oxide delivery; golf clubmaking products: Shaft Extractor/Puller, Frequency and Flat Line Oscillation (Flo) Plane Shaft Analyzer and the Holtzman Loft and Lie Gauge; Snow Skiing Helper; and the Holtzman bowling ball balance scale.



ATACC snowmobile

Tempa Flow

Tempa Flow snowmobile

CV Slide Springs

golf club making products

shaft extractor


Ski Oscillation

Ski Vibration

Ski Damper

nitrous oxide products

bowling pro shop products

fuel/nitrous valve

regulating nozzle