I replaced the metal keeper on my DW-5035 with a keeper off of a M5610 spare strap. Also had to use the silver buckle off that strap on a DW-5600C restoration. Probably not the most cost effective, but at least I got 2 uses out of that spare strap.
Forgot to add this pic, a silicone keeper that sits up high and tucks the tail down.
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Call sign: Wit
Si vis pacem, para bellum