you think pistol squats hit the VMO hard enough though?
varies from person to person. for real isolation your best options are TKEs and SL machine leg extensions while concentrating on firing your VMO. externally rotating your leg a bit and palpating the muscle can both help get it to fire.
this x2 ^^
we used to do partner assisted TKE's: while seated on the floor, leg propped up on a foam roller, partner pushes down on the top of the foot and you just extend for those last few degrees.
i actually had a set of pistols "shut off" my VMO once.. waaay back, just tweaked it at the bottom of a pistol.. took a few weeks for my VMO to fire properly again.. was really weird. Did tons of TKE's to get it back to normal.
oh i see. well have no partner, but still gonna continue hitting TKE's hard solo. and i see. i really like pistols, so i guess ill continue doing them, but just gonna watch out for my VMO to keep firing properly.