I know this thread is old but I thought it was worth a look for you guys. I ran across this site because I was looking for them myself. I have eggbeater 3 pedals and none of the current extenders work. They only have an 8mm allen wrench area on the end of the spindle and thats it. I think these have always been like this but I'm not sure about that.

If you search for hollow pedal extenders or pedalx cycling pedal extenders on a google search you should be able to find them. I think they have them in 25mm and 31mm. The nice thing is they are hollow titanium and by the looks of them they seem very durable. I have been searching for years now to find ones that fit my pedals and I think I have found them. can you guys check this out for me and let me know what you think?

I went through their whole site and I will tell you I am extremely interested.

Thanks in advance.

Matt