Making a 4.25 Inch Dobsonian Reflector Telescope
The eyepieces for the telescope were purchased inexpensively from Surplus Shed a great resource for optics. They are 0.965 inch eyepieces which I now consider little more than toys. Only the longest focal length eyepiece is of much use.
For those inclined to buy, I found a good article on what to consider.
I did however as part of this project try to fabricate my own 1.25 inch eyepiece. I purchased some lenses from Surplus Shed and then machined a barrel on a milling machine. This was a fun project, but I don't recommend it unless it really appeals to you. Along with the milling machine, it required the use of a rotating table, a special beveled bit for the curved outer surface. To create the spacer/holders for the lenses I cut rings out of flat plastic using a laser cutter. These machines are all standard at Tech Shop though you need some training to use them.