Ultegra crank slips side to side
Bought a couple of "Mercier's" one for the wife and one for me. Put them both together tonight and notice that if I push with my foot from the side of the bottom braket, her crank slips in, then if I push from the other side it slips the other way. As if there were no lateral stop on the bottom bracket axle.
I've downloaded the technical notes on the cranks and notice that for the 6603 (triple) there is a spacer to use. (Wondering if this was an error and the spacer is for the 20 spd version.) No spacer on either bike.
Do I just need to loosen the allen bolts on the left crank and slide it toward the bearing? Or do I need a special tool for the crank axle bolt to tighten that (Tool TL-FC16)?
Any advice would be appreciated.