The only defect of this grinder, minor but annoying, is the system for fixing and adjusting the cap of the ejection tube. The four nuts attached to the inside of the duct create regressive jamming primers (from downstream to upstream). In addition, the adjustment is carried out using two plastic head bolts which loosen without any hesitation with vibrations.
So I cut the nuts to level the internal wall; Regarding the axial fixing of the cap, I shunted it from above by connecting the rest of the bolts; Regarding the adjustment, I tried to extend the stroke of the arc of a circle in which these bolts move, but finally, certain constraints mean that there is no room to install an external device ( otherwise, I envisioned a single blocking, with effect on both sides, by eccentric). Therefore, I opted for a central system, offset downwards: a round rod which engages in a hole, itself drilled in a part under the constraint of a spring ... "cold" , it works impeccably: it is the operating mode of the putty guns that I took again; in operation, unfortunately, the vibrations of the cap, amplified by the removal of the nuts from the axle, cause sliding and opening "full pot".
So I have to take it all from the beginning and first make a swivel device worthy of the name, without play and resistant *, then I will test the locking system again and if nothing changes, I will stay in the 'spirit of rapid blocking without element capable of unscrewing, with a notching of the rod V and a latch of complementary shape which comes to engage there.
It is obviously a rather tedious job, because very time-consuming in view of the small volume of the materials used, but I do not intend to "let go" and am more stubborn than these bits of metal!
* I lean towards the use of a technical plastic sheath around a steel axis: the elasticity of this material should allow me to have a tightening effect on the axis, lastingly eliminating any play.