head 16 to accept the training device 12 of the invention the mounting clip 20 may be either fixedly attached to the putter head 10 with the bracket and roller assembly 12 inserted and removed as required or the mounting clip 20 may be removably attached by affixing it to the putter with 34 velcro 34 or the like this removable configuration provides the user with an opportunity to practice the putting stroke using the training device of the invention and then remove the training device prior to making the final putt the flexible nature of the bracket 14 permits the bracket 14 to be held within the clip 20 by tension when mounted the bracket 14 is placed under tension between the fingers 22 and the clip 20 thus holding the bracket and roller in place the bracket 14 is removed by overcoming the tension provided by the fingers 22 and sliding the bracket 14 out of the mounting clip 20 in use a perfectly aligned perpendicular putting stroke will result in minimal friction generated between the roller 18 and the inside surface 15 of the bracket 14 or washer 28 as the roller 18 rolls along the ground any deviation or misalignment from a perfectly perpendicular stroke will result in the generation of friction by the roller 18 as the roller drags along the ground in addition a misaligned putt causes the end of the roller to make contact with the washer or bracket thus resulting in further frictional feedback the friction generated by the roller and bracket is transmitted up the shaft and can be felt by the user the user will subsequently adjust the stroke or hand position on the club to correct for the misalignment the.