[gmx-users] Heavy Hydrogens

[Matthew Harrigan]

Hi all, 
There is an option in pdb2gmx "-heavyh" which shuffles some mass from the connected heavy atom to the hydrogen. I want to do this, but starting from a top, gro pair of files. Specifically, I don't want gromacs to try to regenerate all the forcefield parameters in my top file. Does anyone have suggestions for how I can go about this? 

Thanks, 
Matt