Short story - I want to rebuild my M324 pedals.

Long story - I'm chasing a noise that may or may not be the pedals, but these have done a lot of work and seeing you can rebuild them, I thought it might be fun to give it a go, even if it doesn't cure the strange noise.

Has anyone rebuilt the M324s?

Shimano have an exploded diagram of the things. This shows a dust cover at the outer end (easy to get out I imagine), then a nut and lock nut inside it to tension the bearings and to hold the whole lot together. These need a pair of special tools - basically two tube spanners, one of which fits inside the other.

Do you need the special spanners?
Is there a work around?
Has anyone priced them (shops are shut here now)?

Or maybe I should just give my lbs some more grey hairs (we need an 'evil' smilie)

If you're interested in the strange noise I'm trying to cure, there's a thread covering it here, but there aren't many options left to suggest. I'm now in 'slowly rebuild the bike and hope it goes away' mode ... which it seems to be doing on its own.

Richard