A & C
Thanks for reply re oil filter adapters but I've tried just about everywhere to find a suitable one; the only one that will fit and is approved is the firewall mounted Air Wolf, but it's still a tight fit and I don't like the way that the connecting pipes fit. And your right about the Robin HRs they have the same problem.
Vee Tail
The 100 hr check is straight out of the POH and is quite comprehensive; perhaps more so than the 100hr LAMP. However, it was what the manufacturer recommended at the time and I'm curious about whether or how simple it would be to move to this rather than following the LAMP because it is type specific.