Lee Perfect Powder measure - no more leaks!

[kelbro]

Had this one several years and it works fantastic for 4831 and 4064 but always leaked the fine powders a little. More than I was comfortable with.

Read some of the posts about lapping the cone making some improvement. I had some 600grit left over from a Wheeler barrel lapping kit and had a few minutes so I gave it a shot. Dabbed a little on, rotated it back and forth for about 4 or 5 minutes. Took a look and it all looked even inside. Swabbed it out with alcohol, let it dry and put it back together.

Ran several hoppers through of HP38 and Bullseye. Not a spec. Saw less than a .5gr deviation with those powders. Ran a hopper of 2400 through and the deviation was +/- .1 grain at the worse. What I noticed with the 2400 was that the deviation occurred as the hopper was getting low. When I topped it off, the drops tightened back up. So, keeping the fill pretty consistent may also help.

 

[janobles14]

any more info on this? are you lapping the face of the cone or the inside?

 

[GLOOB]

When you lap, you are sanding both surfaces at the same time. You put the lapping compound on the halves, then put them back together and turn under pressure. This is the only way to make sure the joint stays radially symmetrical and concentric, and that the two halves mate together. It doesn't matter if you end up with minor irregularities or surface scratches, as long as they go all the way around and have a complementary irregularity on the other half.

Also, be sure you don't turn back n forth in one small spot. You need to turn it all the way around to make it radially symmetrical.

I used a chromium buffing bar. Just chipped some away with a knife onto my bench. Put a drop of CLP on it. Then mashed it up with the side of the knife. It worked great, but it took longer than 4-5 minutes, cuz it's so fine. A little bit goes a long way. You don't want any oil to get into the meter.

 

[kelbro]

What GLOOB said. A little on both surfaces and then rotated forward and backward keeping slight pressure applied (it is plastic!). 180 degrees, 120 degrees. 360 degrees.

Didn't think about the CrOx. I use it to paste my straight razor strop.