CM3 board doesn't fit with L2/R2 thumbsticks board

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If I understand correctly, you are talking about a heatsink that was on the Compute Module itself, correct? That heatsink was facing toward the Freeplay circuit board, right?

This is not standard. There were a handful of modules like that which had heatsinks pre-applied. I thought that these had been fully tested and checked out to make sure that nothing was impeding them. I guess that it wasn't fully tested with the add-on board.

We've had HUGE problems obtaining parts lately. Raspberry Pi Compute Modules are sold out all over the place. We ended up buying some that were intended for a different purpose (in a computing cluster) and the guy installed these heatsinks. Then, I think he scrapped the cluster idea, so we bought the modules from him.

We do not typically install the heatsinks. They are not needed for the Freeplay CM3. I'm sorry that you had to deal with that, but it's safe to remove them. I'll make sure that no others go out like that. They were just left on, because there seemed to be no good reason to remove them. Not I know that there IS a good reason.

Ugh. It's been very frustrating trying to get Freeplay CM3 boards and then find out that Raspberry Pi modules are hard to obtain. Sigh.