Timney trigger in Ruger .375 guide gun

[1Birddog!]

I have Timney triggers in many of my firearms. Great triggers and never a problem. I took a new Timney to my gunsmith to install in a new Ruger .375 Guide Gun, LC6. My gunsmith swears it will not fit, even if he grinds it. Both he and I have been on the phone with Timney several times. Timney insists this is the proper trigger and it will need some minor dremel work. My gunsmith insists that the geometry of the trigger is wrong and it can’t be done. Very frustrating! Has anyone installed a Timney in a new Ruger Hawkeye Guide gun? If so, do you have any step by step recommendations for my gunsmith? The original trigger is way, way too heavy. I have ordered a spring from Ernie’s as a last ditch option of lightening the trigger pull. But, I would really prefer the Timney installed.