When using the kitchen worktop jig and its all set up, there seems to be abit of play in the jig when the guide bush is set in place, its only a few mm but does it matter what side i run the guide bush on. Say when im cutting with the router and i run the bush on the right hand side of the inside of the jig on female cut then the left hand side of the inside of the jig on my male cut, would they both fit mm perfect.