Thanks Bob and Dan. It seems a strange way to design something, though, but if that is the way it is, that is the way it is. Stan On 8/30/2011 10:35 AM, Bob Christ wrote: > Stan, that tapered portion is designed to provide assurance that the diagonal > will not fall out if the fastening tension loosens-up. This is a good thing. > My diagonal too has the taper and my visual back employs a compression ring, > and the combination works beautifully. I remove the diagonal every time I > transport my scope and there is zero evidence of the compression ring being > torqued; this after many uses. > > -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.