You may already know this but, you can fly your plane with a spinner (and associated parts), a skull cap, or without those items. My 1966 150F was without any thing. I liked the look, some do not.
I discussed the no spinner option with my IA previously. He’s under the impression that the 150 was never certified that way so going without would create a TCDS issue. He’s got no issue with no spinner on other planes that have been certified that way.
If you got any documentation or leads that I can follow that would help alleviate his TCDS concern that might solve it. Thanks.
I think your IA may be incorrect in his assumption that the 150 was never certified without a spinner. In the TCDS for the 150 and 152 (same TCDS for both) a spinner isn't mentioned on any of the 150 models. A spinner isn't required until the 152 model. (page 10 of the TCDS). Ask him/her to show you where it shows that the spinner is required per the TCDS.
The problem with the spinner is the plastic 0450106-1 which gets brittle with age. If they do exist at all, they're likely to be in poor shape and/or cost the better part of an AMU. And I wouldn't try to use the spinner without it. I went to a skull cap when mine crumbled. But if you decide you want to go with the spinner and can find the plastic piece, I still have the 040027-3 and 040027-10 that I replaced with a skull cap.