There are what I assume to be better unbranded Chinese made tuners available (at least here in UK) which are a significantly improvement on the OE ones. I fitted a set of 'Leader Banjo Co' 'deluxe mandolin machine heads' like these to my 305:

https://www.eaglemusicshop.com/prod/...s-Engraved.htm

...and for about $45 (£35) I'm happy with them. Don't know if they're available in US though - maybe under a different name?