Kizwan, what a lot of people do is fit roller bearings sometimes called "cassette bearings".



I stacked three of these on each other, sorry i forget the size-they fit neatly inside the idler wheel, which is aftermarket, Mato or something and not the one that came with it. But there is still far too much play. The bearings i got from the hobby shop, they are for model cars. i think i need to make a bigger axle that fits more snugly inside the bearings, and fix the bearings inside the idler. I'm using threaded rod for the idler, they fit inside the bearings but not tightly enough. I could probably fix it permanently with JB weld or some such to take out the play. JB Weld is strong enough I could build up the axle with it and sand it down to size and it would work for a long time.
I'm waiting for a Henntec for my king tiger because the tracks too long but if i take out a link it would then be too short. Also I'm waiting for metal susp arms to arrive, going to fit them because the plastic road wheels bow outwards and sometimes the teeth don't go perfectly in their grooves, and so the tracks are chewing them up.