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Thanks for previous information. I cannot place the powder slide (69) on to the measure plate spacer (68) back into the 366. There appears not to be enough space between charge bar and measure plate (67). What am I doing wrong? Although I have three MECs, this is my first experience with a Hornady 366 (410).
Thanks for your help.
 

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Remove the measure assembly. As you remove the measure assembly screw, note if the screw unscrews easily, without effort. If it's binding, after taking off the measure assembly, see if there is any foreign matter on the die head casting putting the measure assembly out of alignment.

Take the measure assembly and flip it upside down (empty, of course!) on the loading bench. The charge bar should go back and forth easily. If it doesn't, take out the charge bar, remove the powder slide, then remove the measure assembly set screws and the sub-measure plate (watch the powder slide spring!). Check that there is no debris in the measure channel. Put the powder slide on the table and confirm it lays perfectly flat and has absolutely no bends. If it does, then probably the best thing to do is replace it. This plate has to be perfectly flat or it will cause binding. Now check the powder and shot seals to confirm that they are smooth and not projecting up excessively—they should be flush or perhaps a touch low (unless you have card stock under the powder seal to help combat the ball powder housekeeping issue) and completely intact. I've also occasionally found shot somehow got on the outside rim of the shot seal—now looking looking quite flat and polished! It's probably wise to remove both seals and make sure there is no debris in the seal openings. While things are apart, inspect the shot rotor rivet on the sub-measure plate for tightness. The rotor should be wobble free. If it's wobbly, you can try tightening it, but you'll probably wind up just replacing the assembly—and Hornady does sell the rotor and sub measure plate combination as an assembly. Take a look at the cam bearing on the charge bar. If it's frozen, it's probably better to replace it.

As you reassemble the unit, pull on the powder slide spring to insure that it is in the furthest out position. When putting the powder slide in, make very sure that it's in position, usually going home with a bit of a click. It may take some fussing with. Install and slide the charge bar back and forth. It has to move quite freely.

Check that the powder slide spring drops perfectly/locks into the notch on the powder slide. If you've found the powder slide slips into the "off" position in the past—even with charge bar moving freely—take a look at how the powder slide spring fits into the powder slide notch. Sometimes the notch in the powder slide is a bit small and a slight enlargement with a small round file fixes the problem, allowing the spring to engage deeper. Finally, rotate the shot rotor. It should move freely.

Re-install the measure assembly back on the 366, confirming the measure is in the die head cutout perfectly and that the powder measure screw threads in effortlessly. The measure attaching bolt must thread in easily after mounting the measure casting assembly. If it does not, you may need to do a bit of fitting work on the measure casting assembly or use another one if you have it.

Finally, confirm that the shot rotor and powder slide move freely between positions. Sometimes the shot rotor slide spring can ride up during installation and bind.
 

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This is tricky. It might be better to take the measure casting off, turn it upside down, take the plate off, then put the charge bar in, reattach the slide and the plate, and make sure everything slides normally.
 
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