Replying to Lifters HELP PLEASE

My bindings the look px 12 came with lifters and i read a bunch of threads saying how you can just take them off and put in smaller screws. I took them to my shop and they said the samller screws for the looks with lifters wont fit through the thread, like theyre to wide or something and since im mounting them to a fujative he said if they grinded the screws down they would be a lot weaker since its a wood core. Has anybody else done this, and if i mount them with the lifters is it gonna be a lot worse for park?