Invader 22
One of the most useful things I've come across in a while - even though I've browsed the ASAP catalogue cover to cover many times, I missed them somehow. Rubber cable grommits, plus fixing cover. These are the medium size - 75 mm hole. They do smaller ones and a double hole version. Ideal for routing stuff through bulkheads - ther'ye cheap too, these are under 2 pounds.
Left, are sone other interesting things I never knew existed. A common thing in any good cycle shop - they are for crimping the cut ends of cycle gear cables, etc. Just the job for crimping on the ends of monel mousing wire - stops the cut ends snagging. These cost me 5 pence each - bought individually.