This is a brand new rocker shaft o-ring seal compression tool.
Fits: Triumph pre-unit, Trident T150, T160, BSA A75 Rocket 3, Triumph unit T90, T100, 5TA, 3TA with rocker spindle shaft with 5/8 inch diameter.
Part # 61-7019
The taper on the inside of this tool eases the transition of the o-ring into the groove in the rocker box, and without it, the o-ring typically gets cut or shaved when pushing the rocker shaft into rocker box. The taper allows the o-ring to be installed, undamaged, resulting in a leak-free install.