Hello ZACH K
I had one of those about (#2333) 40 years ago, you will have to drill out the rivets (2) then able to take out the shaft out as this would be a goodtime to replace the axle bearing bushings as might as well replace both worm gears while you at it. remove the old grease and use red & tacky # 2. you can get replacement rivets from thetraintender.com or replace the rivets with the 4-40 pan head machine bolt and nut. That's what I did and nice thing about it is that you can remove the bolt to service it again in near future. hope this helps
Tiffany
