After I couldn't find my dibber last year, I used a trowel by inserting it and turning it round to make the hole. I haven't noticed any diffenece TBH. I always sow my leek seeds in small pots (about nine to a pot) then thin out at the 3 leaf stage (just after the "crook stage") into a bigger pot - same number per pot and use liquid feed at about a month later. They do fatten up, and I achieved a reasonable thickness to plant out, though they weren't as thick as in previous years. Having harvested some, they have a good length of white stem and a decent thickness. Tornado, I think.