Replacement of worn sheaves in masthead

[dawntreader]

I need to replace the main halyard and topping lift sheaves at the masthead for my B37. The documentation from Selden suggests that for the C211 series masts this is a relatively simple job and can be done without un-stepping the mast. Has anyone any experience of this task?

Also, I cannot (yet) find a components list for the sheave sizes - any help would be appreciated too 

[Mirror45184]

Yes the sheaves lift straight out but how do you suspend yourself without a halyard!

[Mirror45184]

Attached is the sheave list from Selden publication 59-808-E. If you get the mast serial number and send it to Jon Kimberley jon@contender.com.au, he can get all of the information you need to replace the sheaves. I have also attached some photos of the mast top.

[simonmoore]

I had to replace one of the sheaves on my Bavaria 38 (2003).  In my case both sheaves had to be taken out together as they shared a common fixing plate/bracket.  This could not be be done whilst aloft as the topping lift sheave was required to go aloft on to inspect the main halyard.  I did not mind too much as I had recently purchased the boat so did a full overhaul at the same time.

[dawntreader]

Thanks for the replies, photos and docs. I will leave this job to a rigger  as (mentioned earlier) once up the mast you will need to secure yourself to the top and release the halyards. It would have been a bonus if I had some steps up there though