On rare occasions the M A Series III will give a clunking sound when a cutting operation is performed.
Solution :- oil your machine - see oiling
Also note:- Some new machines will make a whirring sound when the handle is moved up and down. This is not a problem and will go away after a few days of hard work.
Photo with screwdriver
On even rarer occasions, the machine may JAM DOWN. If this occurs, do not attempt to un-jam with the handle. Please do thre following.
360deg a couple of times
Please note :- The problem is the result of insufficient oil and may occur on a new or used machine that has been sitting unused for quite some time.
Once un-jammed please oil well, and using the handle rotate the cutting head 360deg a couple of times then re-oil and repeat.
Also Note:- A new machine can also jam, To minimise the possibility, rotate as above before use for the first couple of weeks of service.
On brand new machines cut most work using the back part of the cutting board as shown below. Once the machine is fully "run-in" this cutting position should not be as important.
Also apply this rule to HEAVY DUTY CUTTING
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On older blue machines and early black (one part handle machines)
Please check and tighten the top dial lock screws occassionally
When correctly operating, the top dial must remain still when the head is spun from left to right .
Failure to keep the top scews tight may sometimes cause the top-dail to lock to the head .
Caution :- If you have the latest machine ( with this (2 part) handle) 
the following text does not apply.
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FOR EARLIER MACHINES BOTH BLUE AND BLACK WITH A FIXED ONE PART HANDLE
TOP DIAL GAP (CLUNKING ON HANDLE USE)
This is usually caused because the top dial grub screws have been allowed to loosen slightly.
HERE IS A FIX :- https://lucris.com/service/media/TOP-DIAL-GAP.mp4
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Extreme Circumstance – Top Dial Lock-Up
Important:
This situation is rare and only occurs if the two grub screws in the top dial are allowed to become loose.
Under certain conditions, loose grub screws can cause the top dial to lock solid.
Cause
If the grub screws are not kept tight, the top dial may rotate under load and bind internally, potentially locking the mechanism.
Top-dial (exploded view)
(shown for clarity -- the screws never need to be removed.)
If the Top Dial Locks
Loosen the two grub screws
Turn anti-clockwise only 2–3 turns
Do NOT remove the grub screws
Attempt to rotate the top dial anti-clockwise by hand
If the dial will not move:
If force has previously been applied to the handle, the dial may be locked as tightly as a truck wheel nut
In this case, a plumber’s pipe wrench may be required to break the lock
Apply controlled force only — excessive force can cause damage
After the Dial Is Released
Tighten the top dial clockwise by hand only
Tighten to a light, soft finger-tight feel
Back the dial off anti-clockwise approximately ¼ turn
Re-tighten both grub screws clockwise --very firmly with the hex key
Check grub screw tightness regularly
This will prevent the issue from occurring again
Prevention
✔ Keep grub screws tight
✔ Check periodically as part of routine maintenance
✔ Never force the handle if resistance is felt
