Good question: I put the alloy engine mount on a piece of timber and used a socket with a hammer and tapped it in, make sure you (a) don't dent the sheild and (b) don't hit the inner ring.Thanks all for your replies.
Next problem: with the old plastic engine mount, I can press fit in the layshaft bearing easily. With the new aluminum engine mount, I can't seem to press in the bearing. Do I need a different bearing for aluminum engine mount?
Thanks in advance.