Had to fit this adapter where was the quill stem. Tried putting spacers but because it is narrower at the base they kept moving. Is that dangerous? (other than being dangerously ugly?) :
Origin8 Threadless Quill Adapter converts 1-inch threaded to 1-1/8 thr – The Bikesmiths
High Rider Stem Adapter 28.6 to 22.2mm - Soma Fabrications
Profile Design Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 : Amazon.co.uk: Sports & Outdoors
Head Stem Adaptor Alloy 22.2mm Quill x 1-1/8" Stem Polished Silver - Bevato