Hello, everybody i have just joined the forum, my tale of wo, started when i purchsed a box of bits for the A10 i,e.frame and all the other bits and pieces and what i did not have i had to search for what a big, big, mistake? however the problem that i have now is that when the two halves of the crankcase are joined the crank just locks up,i have had the b.ends,reground,new bearing to the drive side with 3thou shim, new bearing to the timing side,all done by engine rebuilders,can some one please tell me have i got the right crankcase, the engine case has C A,stamped on itA7??, ,but i also have a crankcase with D A, stamped on it just wondering if i should have used that,the parts book list i think two part numbers.for both cases,last but not least not saying i am very clever, with these bikes, but i do try the best i can.it was a project that i thought of over the coming months.any help would be very much appreciated.