In the primary you need to take all the rivets out, and maybe change the spring (can't remember on the spring for sure) Then if you want to spend the money you should gear it down. You should have 23/38 now and probably should go as low as you can with the top gear (19 or 20 min) and really should move some with the bottom one as well, depending on what you want to spend. Take a look at the charts from yammi, might be cheaper to change both gears and use your chain if you can instead of changing the top gear only and having to buy the chain.
I assume your attak has reverse, so it will have a bearing in the bottom gear, so if you don't want to press that out and back into your new bottom gear make sure you buy the bearing for the new one.
