I've tried Neils suggestion and it works. But i do not have much adjustment on the tension with the unpinned blade fitted First one went ping so I always use the guard when using these unpinned blades.
Surprised I was lucky a enough to buy a saw with pinned/unpinned options and the salesman was right. Mind you I can change a pinned blade in 30 seconds but take 2 minutes to do the unpinned one just. Maybe when I get to know the correct tension I'll get faster fitting unpinned blades.
Couple of pic
The blade in the jaws, the curves I can get now, and the tools I found yesterday belonging to the saw.
cheers all and thanks for the offer Gordon..hopefully its sorted now