Comments about Hireko P173:Dynacraft Interchange Putter - Clubhead:

Face aluminum part is about 110 grams, and rear steel attachments are over 300. Together they form a putter more that is 70 grams head heavier than standard 33-36" putters. To bring down the swingweight into the usual D-5 range, a very heavy putter grip with backweighting is required. Also, the marriage of the face with the rear flanges is difficult because the alignment of the two screws, and the threading into the face part is poor. The concept is good, the actual manufacturing is poor. There is no reference in the marketing that is present on the website now that indicates these putters ought to be belly or long putters, which they probably should.