Thanks for the pictures and guide, I am restoring an Aiwa AD-1250 that must have been stored in an attic - the belts were totally disintegrated. An new set of belts enables fast forward, fast reverse and the counter to work fine - but in 'play' the take up reel does not move due to the idler wheel not rotating. The audio sounds great for 2 seconds until I stop play with tape 'bunch up' inside the cassette. I have lightly sanded the idler wheel rubber, and it looks OK. In 'play' there is apparent pressure on the idler wheel pushing it between the capstan shaft and take up spool - yet it stays still - like the idler wheel has shrunk ?. My idler wheel is 21mm in diameter, the Aiwa AD-1260 and AD-2000 mechanisms are similar, appreciate any advice - thanks