Yesterday I built my own air kit for my sizer and it only took about an hour. The secret was an air cylinder from Grainger that is on clearance for $11.60. (http://www.grainger.com/Grainger/SPE...Cylinder-3ARU3).
This is a 7/8” bore with a 5” stroke. The nose threads right into the cap on the sizer and the only thing that took anything more than a piece of 1/8” pipe, was coming up with a plunger that would work.
The plunger I came up with is made from one 5/16 x 3” bolt, a short piece of 3/4” SCH40 PVC for a ‘body’, a couple fender washers and one nut. I stole the hycar piston (S107) from the stock plunger.
To make the plunger:
1. Stick the bolt with a washer through the hycar piston from bottom to top.
2. Cut the PVC to a length that would leave about ½” of exposed threads
3. Drop a couple of fender washers onto the bolt and center onto the end of the PVC
4. Run a nut onto the end of the bolt.
5. **IMPORTANT** Make sure the bolt does not stick out of the nut. Leaving the end of the bolt one thread inside the nut provides a natural ‘seat’ for the end of the push rod.
That’s it. I already had a regulator and the appropriate fittings lying around to make the connections. I hooked it up, ran it up to 60psi and I was done. It works great!
Now, I admit that my quickee plunger is not great, but it works. I will most likely replace it with a piece of tapped aluminum bar stock. Other than that, it’s done.
One extra advantage of moving away from the screw plunger is that my lube sticks can now be 4.5” in length. When the sizer is empty, my lube sticks come all the way up to the bleed hole.
I haven’t included a picture because my feed looks like the Magma model. My cylinder looks to be a bit shorter, but other than that, they are very similar.
The real secret to the success to this feed kit is the cheap cylinder. These are on clearance at Grainger, so no idea how long they will last.
Good luck,
Chuck