The lower deadeye strops on my current build have the form of a question mark (?) formed from brass wire. It is easy to form these so that the deadeye will just fit into the loop at the top but the next step is to tighten the loop into the groove round the deadeye. If pliers are used they tend to squeeze the strop locally but turn it into an oval such that it loosens the fit at other points. I have done a web search for suitable crimping pliers but the only likely candidate was a pair of pliers for crimping rings on bird legs: very specialised and very expensive.
An alternative would be a conical hole with slit down the side into which the assembly could be pushed. Cue: a basic pencil sharpener with the blade removed. Placing the assembly into this and using a piece of dowel as a drift, gently tapped, closes the loop nicely. It works for 4mm and 5mm deadeyes. It even helps forming the small loop at the bottom of the strop. A < £2 solution

An alternative would be a conical hole with slit down the side into which the assembly could be pushed. Cue: a basic pencil sharpener with the blade removed. Placing the assembly into this and using a piece of dowel as a drift, gently tapped, closes the loop nicely. It works for 4mm and 5mm deadeyes. It even helps forming the small loop at the bottom of the strop. A < £2 solution













