With the help of @scherrit's vice we swapped the spider for the P2M this morning. I test fitted the cranks and it looks like the 104mm is doable but it might depend on how close my feet are to the chainstay so it'll need a proper fit and then a ride test to see if it works. If not, the 109mm will go in. So thanks for your tool loan - I'll get it back to you soon
With the help of @scherrit's vice we swapped the spider for the P2M this morning. I test fitted the cranks and it looks like the 104mm is doable but it might depend on how close my feet are to the chainstay so it'll need a proper fit and then a ride test to see if it works. If not, the 109mm will go in. So thanks for your tool loan - I'll get it back to you soon