Oh boy - the mod was done a while back, this pic is from back then. I'm thinking it worked ok - using a lower profile centering piece, and possibly thicker MCPCB, but I believe these bigger MCPCB's are already fairly thick, in the 1.5mm range, close to a Noctigon or SinkPAD. For some stupid reason, I don't have many pics from the mod and the light is sold off to a relative, hunting/fishing activity. I can find out a little more from the stock lights I have.
Stock Yezl Y3 white wall beamshot here in the M12 review in the OP: https://budgetlightforum.com/t/-/27258. Don't think you can tell much, but, it's a wall beamshot...