78 mm ID Stamped Clutch Drum - Clutch Bell with 12 mm x 1.50 female right hand threads

Stamped Clutch Drum 78 mm ID clutch drum that has a hub welded to the drum with 12 mm x 1.50 female right hand threads.
These clutch drum are to be used with the 1.16" tall engine spacer like parts # 3203.

We will be changing all the Drive rollers so they can be used with the smaller engines that use the 54 mm ID clutch drums and the larger engines that use the 78 mm ID clutch drum / clutch bells with the 12 mm x 1.50 female right hand threads.

Hub OD  .98" or 24.89 mm
Stands .61" above the drum. 
.865" or 21.97 mm deep inside of drum.
Over height 1.58" or 40.13 mm
Wall  0.78" or 2.06 mm
Depth of threads .70"  or 17.80 mm

Note:  The stamped clutch Drums shown have been Zinc Plated in the 2nd picture.  They do not require zinc plating so you may get one that is NOT zinc plated.