We generally do not advise using filler in metal wood dents. We have done it before on smaller dents and it just does not hold. When we have done it, we drilled a very small hole in the dent, put the filler in, sanded smooth, painted over it and although it looked OK, it did not take long for it to break loose. On metal woods, the whole head moves at impact and the movement and vibration that occurs it seems is too much for a filer to hold for very long. It’s been so long since we have even tried it I don’t have the type of filler we used. I will try and find out and post it just in case you want to give it a try.