Thanks to the description provided by Chexi, and some modifications, I was able to take on putting the 4th speaker in the combing pad and am happy with the results. Since I was unable to find out how this was done, below is the response from Chexi on his:
"When I took the combing pad off and then took the vinyl off, I made a hole with a hole saw in the starboard of the combing pad and just cut the foam. Go small (just enough for the back of the speaker to go through. Then line up the combing pad with the deck and mark what you need to cut of the deck fiberglass. I used a jigsaw for that. Pretty easy. Put the vinyl back on, then cut the vinyl at the speaker location like a pizza with 6 slices. Again, go smaller than you think on those cuts. Heat up the vinyl in the sun (better) or with a hair dryer (if not sunny) and staple the points of the vinyl on the back of the starboard with stainless steel or monel staples. Try to pull the vinyl all the way around the back so you get full vinyl coverage on the front part. This is why you go small on the cuts. The vinyl will stretch, and you should be able to do this. You should get a nice circle. This of course is if you are using surface mount speakers like mine.
Note, I added in a small relatively thin piece of cutting board between the combing pad and the foam to add strength for the speakers to mount to. As a result, I did not need to put in a PVC tube or anything like that. I just drilled through the speaker mount holes through the cutting board and starboard (and the vinyl). You can avoid putting holes in the vinyl by using a PVC tube and L brackets with short bolts. "
I also used a soldering iron to punch through the vinyl for the mounting screws.
End result - sorry pic was taken under covered storage and at about the only angle my iphone would allow to get both speakers.
"When I took the combing pad off and then took the vinyl off, I made a hole with a hole saw in the starboard of the combing pad and just cut the foam. Go small (just enough for the back of the speaker to go through. Then line up the combing pad with the deck and mark what you need to cut of the deck fiberglass. I used a jigsaw for that. Pretty easy. Put the vinyl back on, then cut the vinyl at the speaker location like a pizza with 6 slices. Again, go smaller than you think on those cuts. Heat up the vinyl in the sun (better) or with a hair dryer (if not sunny) and staple the points of the vinyl on the back of the starboard with stainless steel or monel staples. Try to pull the vinyl all the way around the back so you get full vinyl coverage on the front part. This is why you go small on the cuts. The vinyl will stretch, and you should be able to do this. You should get a nice circle. This of course is if you are using surface mount speakers like mine.
Note, I added in a small relatively thin piece of cutting board between the combing pad and the foam to add strength for the speakers to mount to. As a result, I did not need to put in a PVC tube or anything like that. I just drilled through the speaker mount holes through the cutting board and starboard (and the vinyl). You can avoid putting holes in the vinyl by using a PVC tube and L brackets with short bolts. "
I also used a soldering iron to punch through the vinyl for the mounting screws.
End result - sorry pic was taken under covered storage and at about the only angle my iphone would allow to get both speakers.
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