RG-G Brass Carrier

HI,
 The blue prints for the RG-G carrier block call for a flat bottom .420 hole 1.750 deep. The flat bottom is no problem, but the .420 hole size is for me any way. The closest size of drill is a 27/64 which is .4219 and the same for my reamers. Did you guys use a letter Z drill which is .413 and then ream with a .420 special size of reamer or some other way? Thanks
bruski

[Dave]

I drilled mine to .413 then I made a d-bit out of tool steel...

I made my carrier in two pieces connected with a rabbet and indexed on a 3/16\" dowel pin. The makes it easy to bore the holes to finish size using an adjustable boring head.

gary

Thanks guys, both ways sound great. I have a boring head and the tool steel to make a D cutter. It took me a while to center the block on my rotary table so I might try the D cutter on this one. If the finish doesn\'t polish out, I can always start over with another piece.
bruski

[Dave]

I like nitewatchmans idea.... Thats thinking!

I also drilled and flat bottom drilled undersize and then bored to .420.

I found a .420 reamers through www.drillsandreamers.com   Their index: Reamers/chucking reamers/decimal chucking reamers page 14. Their listing is not strictly in ascending numerical order, but you will finally find the right size.  Less than $20. I also found a couple other sized needed.