Block holders for AO (black) microtomes

I was wondering if anyone out there who still uses the old black AO microtome 
is using a clamp-type block holder. We tried one from Surgipath and it does 
not seem to fit very well--the block holder has some play in it when it 
should be firmly seated in the microtome.  We are currently using the 
Tissue-Tek block holders for which certain parts have to be replaced as they 
get worn.  We would like to use a clamp-type holder in which you pull the 
lever forward in order to place the block in the chuck, then release the 
lever to hold the block in place.

Thanks for any and all help!!
Jeanne Godine
Pathology Consultants
Lynchburg, VA 

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