Dovetail Mounting system.A simple Double Dovetail mounting system for holders and accessories.A replacement Back Mount (with a slight 4degree vertical angle to the mount) and the choice of two lengths of spindle for a single reel, one slightly shorter than the other. (I prefer to use the slightly longer of the two)A Top Clip allows for mounting the filament reel or holder on the top edge works well for large diameter spools and my Comprehensive Filament Holder  as well as some other accessories for mounting an IP camera or other as well as a simple Selfi Stick Clip.March 2015 Added a larger Loose Filament Hook to use with larger loose filament bundles.The simple Loose filament Hook, works well for small sample lengths of filament, I've used 10m samples at the moment, they simply slip round. Other accessories can be attached to the blank dovetail plate part. (Please share your suggestions and plates may be designed) If other diameters of Spool holder are wanted I can see about producing them and adding them to the site.Hope you find them useful, IzzyPlease share your suggestions, comments and photos.