I have just sent money to Ben Crisp at TTV for a lightweight 228 forged flywheel.
This idea started a few months ago when I just got the reflex to send a request to several flywheel manufacturers in USA and UK.
Only TTV in UK gave me a potential yes, if I sent a cast flywheel to them.
This was done during Christmas.
Ben Crisp was my contact and he managed me with top level professional approach.
I got a quote for 308 pounds shipped to Sweden. Equals approximately USD 500 at todays rate.
Delivery in 4-6 weeks.
I will post progress.
http://www.ttvracing.com/