Cuprajake
Talking of WDT
I got this for about £7 on the bay. Its not bad for the money. One of the needles is slightly loose now but I think it helps with basket prep, evening out the density and level before tamping. I’m not one for excess faff but I have found this worthwhile, IMO. I have applied zero scientific rigour in that assessment, it just seems better than not. I would not spend the money Reiss was asking for the ‘real deal’ but for under a tenner it’s worth a shot. 
