block - single or double cheek

[dolphin]

good afternoon,

i am planning to change my deck block RF871 - single cheek, flat base

what is the difference between single and double cheek - is any problem if instead of sigle cheek, i replace with double cheek block

thanks and brgds

 

[michael_w]

You'll get two sheaves. Handy for rigging extra sheets/guys etc. Might need longer bolts, depends on design.

 

[merseamercy]

If it's single cheek, you will most likely want the same. Why are you replacing it?

 

[dolphin]

thanks for replies
i wang to replace because the sheave is damaged
but strange - it has canal on the sheave only from upper part
or if you look on the sheave, the base (part closes to deck or down side of the block) is with d=45 mm and upper part is with d=15 mm - i have never see a block with this form.
usualy the sheave is symmetrical on low and upper part and between is passing the rope.

 

[rogerthebodger]

This is the double block of the same type as RF871

This is the single block RF871

Complete product range for same size block here

 

[dolphin]

thanks for replies
sorry but what is the form of the sheave/s ?
from the photoes it is not clear - is symmetrical or
one side of the sheave is smaller then the other ?
thanks

 

[rogerthebodger]

Had a look at one this afternoon and the sheave is symmetrical so I think yours must be damaged.