Technical Data

Golf Putter Hosel Types
Type A:  No hosel.  Shaft is inserted directly into putter head.  See ‘Marble’ putter.
Type B:  Exposed hosel.  Shaft is inserted into a cupped tip.  See ‘Stewart’ putter.
Type C:  Semi-exposed.  Shaft slipped over reduced-radius portion of the hosel.
See ‘Knabb’ putter.
Type D:  Forward offsett.  Shaft has forward offset at narrow blade-style putter.
Golf Putter Head Balance Types
Type A:  Head Balanced
Putter head is designed and fabricated to be balanced at center of geometry [where ‘sweet-spot’ is located]. After shaft and grip are added, the head-face will tilt when supported at shaft. This is and has been a standard practice for many years and does not affect the playability of the putter.  It is common on blade style putters.
Type B:  Head + Shaft Balanced
Putter head is designed and fabricated to be balanced at center of geometry [where ‘sweet-spot’ is located]. After shaft and grip are added, the head-face will remain perpendicular to target line when supported at shaft. This is the more prevalent design method for modern putters, especially mallet style putters.
Golf Putter Lie
The "Lie" of a club refers to the face / head position relative to the putting surface
A.  Correct position:
The bottom of putter should be parallel to the putting surface.
B.  Toe – Upright position:
This usually occurs with tall players that are forced to bend down due to standard putter shaft length being too short, causing an upright shaft position and causing the toe to contact the ground.
C.  Heel – Flat position:
This occurs with shorter players that are forced to position standard putter lengths further from their bodies resulting in a flat position and causing heel to contact the ground.
A custom length shaft or a custom head / shaft angle, or both, will solve these issues.
The Stewart Putter herein is an example of a very custom lie angle.
Golf Putter Ground Sitting
The shape of the bottom of the putter head will affect how the putter sits on the ground and it mostly depends on how the golfer holds the putter during address.  Both options are based on preference and do not affect the playability of the putter.
Type A:  Cylindrical or flat bottom
Golfer addresses ball and aligns golf putter by repeatedly closing and opening hands.  When ready to stroke the putter, golfer closes hands grasping putter.
With open hands the loose putter will sit on ground and remain in the same position due to the substantially cylindrical or flat bottom having a greater axial surface contact with the ground.
Type B:  Double Curvature Bottom
Golfer addresses ball and aligns golf putter with a full grip on putter.
If hands are opened, the putter head sitting on ground may rotate slightly due to gravity and the smaller contact surface with the ground.
This curved bottom is fine for players who carefully position their hands on grip first, then align their putter without changing their grip.  It is also suitable for players who hover their putters without contacting the putting surface.

Side View Drawings

Example of Double Curvature bottoms:
See Knabb Putter, Marble Putter.
Example of Cylindrical / Flat bottoms:
See Reinhard Putter, Stewart Putter, Bars Putter.

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